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①-7/5 +(+ 1/10)
=-1.4+0.1
=-1.3
②90-(-3)
=90+3
=93
③-0.5-(-3 )+2.75-(+7 )
=0.5+3+2.75-7
=6.25-7
=-0.75
④ (-2.8)+(+1.9)
=-2.8+1.9
=-0.9
就类似的,换换娄
-09+1.1-(0.2)+1/5-3/4
=0.2-0.2+0.2-0.75
=0.95
1又1/2-3又4/5-(-2。5)
=1。5+2。5-3。8
=4-3。8
=0。2
1)(-9)-(-13)+(-20)+(-2)
= -9+13-20-2
=-18
(2) 3+13-(-7)÷6(-38)+52+118+(-62)
= (-38-62)+(52+118)
=-100+170
=70
(-32)+68+(-29)+(-68)
= (-32-29)+(68-68)
=-61
(-21)+251+21+(-151)
= (-21+21)+(251-251)
=0
12+35+(-23)+0
= 37-23
=14
(-6)+8+(-4)+12
= 2-4+12
=-2+12
=10
27+(-26)+33+(-27)
=1+33-27
=34-27
=7
39+[-23]+0+[-16]
= 16+0-16
=16-16
=0
[-18]+29+[-52]+60
= 18+23+52+60
=41+52+60
=93+60
=153
[-3]+[-2]+[-1]+0+1+2
=3+2+1+0+1+2
=9
(-301)+125+301+(-75)
= (-301+301)+(125-75)
=0+50
=50
1-4/9 = 5/9
1-7/10=3/10
8/15-5= -4又7/15
7-15=-8
2/8-5/8=-3/8
11/12-10/12= -1/12
42-(3+3 )
= 42-6
=36
1/3- 7/12-7/18
=12/36-21/36-14/36
=(12-21-14)/36
=-23/36
1 -1/3-1 1/5
=2/3-1/5
=10/15-3/15
=7/15
10-7/10= 9又3/10
5/24+3/8
=5/24+9/24
=14/24
=7/8
1-3/5=2/5
4.39x1/13x2/3
=3x2/3
=2
1+(-2)+(-3)+4+5+(-6)+(-7)+8+9+(-10)+(-11)+12
=-1-3+4+5-6-7+8+9-10-11+12
=-4+4+5-6-7+8+9-10-11+12
=5-6-7+8+9-10-11+12
=-1-7+8+9-10-11+12
=-8+8+9-10-11+12
=9-10-11+12
=-1-11+12
=-12+12
=0
(-7分之1)+(-7分之2)+1又7分之3
=-7分之3+1又7分之3
=1= 3+13+7/6
=17又6分之1
(3) (-2)-8-14-13
= -2-8-14-13
=-10-14-13
=-24-13
=-37
(4) (-7)×(-1) ÷7+8
=7÷7+8
=1+8
=9
(5) (-11)×4-(-18) ÷18
=-44+1
=-43
=-1.4+0.1
=-1.3
②90-(-3)
=90+3
=93
③-0.5-(-3 )+2.75-(+7 )
=0.5+3+2.75-7
=6.25-7
=-0.75
④ (-2.8)+(+1.9)
=-2.8+1.9
=-0.9
就类似的,换换娄
-09+1.1-(0.2)+1/5-3/4
=0.2-0.2+0.2-0.75
=0.95
1又1/2-3又4/5-(-2。5)
=1。5+2。5-3。8
=4-3。8
=0。2
1)(-9)-(-13)+(-20)+(-2)
= -9+13-20-2
=-18
(2) 3+13-(-7)÷6(-38)+52+118+(-62)
= (-38-62)+(52+118)
=-100+170
=70
(-32)+68+(-29)+(-68)
= (-32-29)+(68-68)
=-61
(-21)+251+21+(-151)
= (-21+21)+(251-251)
=0
12+35+(-23)+0
= 37-23
=14
(-6)+8+(-4)+12
= 2-4+12
=-2+12
=10
27+(-26)+33+(-27)
=1+33-27
=34-27
=7
39+[-23]+0+[-16]
= 16+0-16
=16-16
=0
[-18]+29+[-52]+60
= 18+23+52+60
=41+52+60
=93+60
=153
[-3]+[-2]+[-1]+0+1+2
=3+2+1+0+1+2
=9
(-301)+125+301+(-75)
= (-301+301)+(125-75)
=0+50
=50
1-4/9 = 5/9
1-7/10=3/10
8/15-5= -4又7/15
7-15=-8
2/8-5/8=-3/8
11/12-10/12= -1/12
42-(3+3 )
= 42-6
=36
1/3- 7/12-7/18
=12/36-21/36-14/36
=(12-21-14)/36
=-23/36
1 -1/3-1 1/5
=2/3-1/5
=10/15-3/15
=7/15
10-7/10= 9又3/10
5/24+3/8
=5/24+9/24
=14/24
=7/8
1-3/5=2/5
4.39x1/13x2/3
=3x2/3
=2
1+(-2)+(-3)+4+5+(-6)+(-7)+8+9+(-10)+(-11)+12
=-1-3+4+5-6-7+8+9-10-11+12
=-4+4+5-6-7+8+9-10-11+12
=5-6-7+8+9-10-11+12
=-1-7+8+9-10-11+12
=-8+8+9-10-11+12
=9-10-11+12
=-1-11+12
=-12+12
=0
(-7分之1)+(-7分之2)+1又7分之3
=-7分之3+1又7分之3
=1= 3+13+7/6
=17又6分之1
(3) (-2)-8-14-13
= -2-8-14-13
=-10-14-13
=-24-13
=-37
(4) (-7)×(-1) ÷7+8
=7÷7+8
=1+8
=9
(5) (-11)×4-(-18) ÷18
=-44+1
=-43
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