2个回答
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脱式计算:
1、464+636-142
2、737×53-42
3、40÷5-3
4、866-32+43
5、 97-32×4
6、87-65×3
7、45÷9+36
8、57-45-4
9、87-37÷10
10、98+23-43
运算方式
在四则运算中,加法和减法叫做第一级运算,乘法和除法叫做第二级运算。含有两种或两种以上的运算的算式,通常称为混合运算。加、减、乘、除的混合运算也叫做四则混合运算。在四则混合运算中,规定的计算先后次序,称为运算顺序。
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(1)45.55-(6.82+15.55) (2)34.52-17.87-12.23
(3)6.43-(1.4-0.57) (4)23.75-8.64-3.46
(5)17.83-9.5-7.83-0.5 (6)5.38+88.2-2.38+1.8
(7)27.38-5.34+2.62-4.66 (8)21.63-(8.5+9.63)
(9)7.5-2.45+7.5+2.45 (10)0.9+0.99+0.999
(11)5.09-(0.09+1.23) (12)9.36-(4.36-3.5)
(13)609-708+306-108+202-198+497-100 (14)14+15+16+……+45+46
(15)9999+9998+9997+9996 (16)99999×26+33333×22
(17)19175÷59+678 (18)36.5×1.4-8.51
(19)1.3-3.79+9.7-6.21 (20)8×0.4×12.5×2.5
(21)125×(8+0.8+0.08) (22)45 ÷〔78 -(25 +38 )〕
(23)1.7+150 +3.98 (24)92.4-(4.4+58 )
(25)3.35×6.47×2+6.7×3.6 (26)18.7-3.375-6.625
(27)2.5×4.4 (28)25×1.25×32
(29)(3.75+4.1+2.35)×9.8 (30)1.28+9.8+7.72+10.2
(31)12 ×1120 +12 ×2049 (32)120-144÷18+35
(33)347+45×2-4160÷52 (34)(58+37)÷(64-9×5)
(35)95÷(64-45) (36)85+14×(14+208÷26)
(284+16)×(512-8208÷18) (38)120-36×4÷18+35
(58+37)÷(64-9×5) (40)(6.8-6.8×0.55)÷8.5
答案
(1)23.18
(2)4.42
(3)5.6
(4)11.65
(5)0
(6)93
(7)20
(8)3.5
(9)15
(10)2.889
(11)3.77
(12)8.5
(13)500
(14)1950
(15)39990
(16)3333300
(17)1003
(18)42.59
(19)1
(20)100
(21)1110
(22)3
(23)155.68
(24)30
(25)67.469
(26)8.7
(27)11
(28)1000
(29)99.96
(30)29
(31)38028
(32)147
(33)357
(34)5
(35)5
(36)393
(37)16800
(38)77
(39)5
(40)0.36
0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100=1000
1.25×(8+10)
=1.25×8+1.25×10
=10+12.5=22.5
9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
1.24×8.3+8.3×1.76
=8.3×(1.24+1.76)
=8.3×3=24.9
9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=10008999
14.8×6.3-6.3×6.5+8.3×3.7
=(14.8-6.5)×6.3+8.3×3.7
=8.3×6.3+8.3×3.7
8.3×(6.3+3.7)
=8.3×10
=83
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
933-157-43
=933-(157+43)
=933-200
=733
4821-998
=4821-1000+2
=3823
I32×125×25
=4×8×125×25
=(4×25)×(8×125)
=100×1000
=100000
9048÷268
=(2600+2600+2600+1248)÷26
=2600÷26+2600÷26+2600÷26+1248÷269
=100+100+100+48
=348
2881÷ 43
=(1290+1591)÷ 434
=1290÷43+1591÷43
=30+37
3.2×42.3×3.75-12.5×0.423×16
=3.2×42.3×3.75-1.25×42.3×1.6
=42.3×(3.2×3.75-1.25×1.6)
=42.3×(4×0.8×3.75-1.25×4×0.4)
=42.3×(4×0.4×2×3.75-1.25×4×0.4)
=42.3×(4x0.4x7.5-1.25x4x0.4)
=42.3×[4×0.4×(7.5-1.25)]
=42.3×[4×0.4×6.25]
=42.3×(4×2.5)
=4237
1.8+18÷1.5-0.5×0.3
=1.8+12-0.15
=13.8-0.15
=13.65
6.5×8+3.5×8-47
=52+28-47
=80-47
(80-9.8)×5分之2-1.32
=70.2X2/5-1.32
=28.08-1.32
=26.76
8×7分之4÷[1÷(3.2-2.95)]
=8×4/7÷[1÷0.25]
=8×4/7÷4
=8/7
2700×(506-499)÷900
=2700×7÷900
=18900÷900
=21
33.02-(148.4-90.85)÷2.5
=33.02-57.55÷2.5
=33.02-23.02
=10
(1÷1-1)÷5.1
=(1-1)÷5.1
=0÷5.1
=0
18.1+(3-0.299÷0.23)×1
=18.1+1.7×1
=18.1+1.7
=19.8
(3)6.43-(1.4-0.57) (4)23.75-8.64-3.46
(5)17.83-9.5-7.83-0.5 (6)5.38+88.2-2.38+1.8
(7)27.38-5.34+2.62-4.66 (8)21.63-(8.5+9.63)
(9)7.5-2.45+7.5+2.45 (10)0.9+0.99+0.999
(11)5.09-(0.09+1.23) (12)9.36-(4.36-3.5)
(13)609-708+306-108+202-198+497-100 (14)14+15+16+……+45+46
(15)9999+9998+9997+9996 (16)99999×26+33333×22
(17)19175÷59+678 (18)36.5×1.4-8.51
(19)1.3-3.79+9.7-6.21 (20)8×0.4×12.5×2.5
(21)125×(8+0.8+0.08) (22)45 ÷〔78 -(25 +38 )〕
(23)1.7+150 +3.98 (24)92.4-(4.4+58 )
(25)3.35×6.47×2+6.7×3.6 (26)18.7-3.375-6.625
(27)2.5×4.4 (28)25×1.25×32
(29)(3.75+4.1+2.35)×9.8 (30)1.28+9.8+7.72+10.2
(31)12 ×1120 +12 ×2049 (32)120-144÷18+35
(33)347+45×2-4160÷52 (34)(58+37)÷(64-9×5)
(35)95÷(64-45) (36)85+14×(14+208÷26)
(284+16)×(512-8208÷18) (38)120-36×4÷18+35
(58+37)÷(64-9×5) (40)(6.8-6.8×0.55)÷8.5
答案
(1)23.18
(2)4.42
(3)5.6
(4)11.65
(5)0
(6)93
(7)20
(8)3.5
(9)15
(10)2.889
(11)3.77
(12)8.5
(13)500
(14)1950
(15)39990
(16)3333300
(17)1003
(18)42.59
(19)1
(20)100
(21)1110
(22)3
(23)155.68
(24)30
(25)67.469
(26)8.7
(27)11
(28)1000
(29)99.96
(30)29
(31)38028
(32)147
(33)357
(34)5
(35)5
(36)393
(37)16800
(38)77
(39)5
(40)0.36
0.4×125×25×0.8
=(0.4×25)×(125×0.8)
=10×100=1000
1.25×(8+10)
=1.25×8+1.25×10
=10+12.5=22.5
9123-(123+8.8)
=9123-123-8.8
=9000-8.8
=8991.2
1.24×8.3+8.3×1.76
=8.3×(1.24+1.76)
=8.3×3=24.9
9999×1001
=9999×(1000+1)
=9999×1000+9999×1
=10008999
14.8×6.3-6.3×6.5+8.3×3.7
=(14.8-6.5)×6.3+8.3×3.7
=8.3×6.3+8.3×3.7
8.3×(6.3+3.7)
=8.3×10
=83
1.24+0.78+8.76
=(1.24+8.76)+0.78
=10+0.78
=10.78
933-157-43
=933-(157+43)
=933-200
=733
4821-998
=4821-1000+2
=3823
I32×125×25
=4×8×125×25
=(4×25)×(8×125)
=100×1000
=100000
9048÷268
=(2600+2600+2600+1248)÷26
=2600÷26+2600÷26+2600÷26+1248÷269
=100+100+100+48
=348
2881÷ 43
=(1290+1591)÷ 434
=1290÷43+1591÷43
=30+37
3.2×42.3×3.75-12.5×0.423×16
=3.2×42.3×3.75-1.25×42.3×1.6
=42.3×(3.2×3.75-1.25×1.6)
=42.3×(4×0.8×3.75-1.25×4×0.4)
=42.3×(4×0.4×2×3.75-1.25×4×0.4)
=42.3×(4x0.4x7.5-1.25x4x0.4)
=42.3×[4×0.4×(7.5-1.25)]
=42.3×[4×0.4×6.25]
=42.3×(4×2.5)
=4237
1.8+18÷1.5-0.5×0.3
=1.8+12-0.15
=13.8-0.15
=13.65
6.5×8+3.5×8-47
=52+28-47
=80-47
(80-9.8)×5分之2-1.32
=70.2X2/5-1.32
=28.08-1.32
=26.76
8×7分之4÷[1÷(3.2-2.95)]
=8×4/7÷[1÷0.25]
=8×4/7÷4
=8/7
2700×(506-499)÷900
=2700×7÷900
=18900÷900
=21
33.02-(148.4-90.85)÷2.5
=33.02-57.55÷2.5
=33.02-23.02
=10
(1÷1-1)÷5.1
=(1-1)÷5.1
=0÷5.1
=0
18.1+(3-0.299÷0.23)×1
=18.1+1.7×1
=18.1+1.7
=19.8
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