Question

出5个初一数学的计算题及答案

Answer 1

.（7x^2-2x)-(4-6x+2x^2)
=7x^2-2x-4+6x-2x^2
=7x^2-2x^2-2x+6x-4
=5x^2+4x-4
(2) (a-b)^2×(b-a)
=(b-a)^2*(b-a)
=(b-a)^3

3..-12（a^4b^3c)^2÷(1/2a^2b^3)^2
=-12(a^8b^6c^2)÷(1/4a^4b^6)
=-12a^8b^6c^2÷(1/4a^4b^6)
=-48a^4C^2

(4)[(3a-2b)^2-(3a+2b)(3a-2b)]÷（2b-3a)
=(9a^2-12ab+4b^2-9a^2+4a^2)÷(2b-3a)
=(8b^2-12ab)÷(2b-3a)
=4b(2b-3a)÷(2b-3a)
=4b

(5)4（a^2+b)(a^2-b)-(2a^2-b^2)
=4(a^4-b^2)-2a^2+b^2
=4a^4-4b^2-2a^2+b^2
=4a^4-2a^2-3b^2
=4*16-2*4-3*25
=-19

追问

稍微简单点的，

行不

这个太复杂了，看不懂

追答

e

好吧

追问

嗯嗯，要快哦，谢了

追答

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

[-18]+29+[-52]+60= 19

[-3]+[-2]+[-1]+0+1+2= -3

[-301]+125+301+[-75]= 50

[-1]+[-1/2]+3/4+[-1/4]= -1

[-7/2]+5/6+[-0.5]+4/5+19/6= 1.25

[-26.54]+[-6.14]+18.54+6.14= -8

1.125+[-17/5]+[-1/8]+[-0.6]= -3

自己选吧