初中,有理数的加减法。1-4+3-0.5,-2.4+3.5-4.6+3.5,(-7)-(+5)+(-4)-(-10),
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解决时间 2021-03-31 18:21
- 提问者网友:动次大次蹦擦擦
- 2021-03-31 10:54
初中,有理数的加减法。1-4+3-0.5,-2.4+3.5-4.6+3.5,(-7)-(+5)+(-4)-(-10),
最佳答案
- 五星知识达人网友:酒醒三更
- 2021-03-31 11:06
解:1-4+3-0.5
=(1+3)+[-4+(-0.5)]
=4+(-4.5)
=-(4.5-4)
=-0.5
-2.4+3.5-4.6+3.5
=[-2.4+(-4.6)]+(3.5+3.5)
=-7+7
=0
(-7)-(+5)+(-4)-(-10)
=(-7)+(-5)+(-4)+10
=-16+10
=-(16-10)
=-6
3/4-2/7+(-1/6)-(-2/3)
=3/4+(-2/7)+(-1/6)+2/3
=(3/4+2/3)+[-2/7+(-1/6)]
=17/12+(-19/42)
=17/12-19/42
=119/84-38/84
=27/28
=(1+3)+[-4+(-0.5)]
=4+(-4.5)
=-(4.5-4)
=-0.5
-2.4+3.5-4.6+3.5
=[-2.4+(-4.6)]+(3.5+3.5)
=-7+7
=0
(-7)-(+5)+(-4)-(-10)
=(-7)+(-5)+(-4)+10
=-16+10
=-(16-10)
=-6
3/4-2/7+(-1/6)-(-2/3)
=3/4+(-2/7)+(-1/6)+2/3
=(3/4+2/3)+[-2/7+(-1/6)]
=17/12+(-19/42)
=17/12-19/42
=119/84-38/84
=27/28
全部回答
- 1楼网友:十鸦
- 2021-03-31 15:55
1-4+3-0.5=1+3-(4+0.5)=4-4.5=-0.5
-(2.4.+4.6)+3.5+3.5=-7+7=0
-7-5-4+10=-16+10=-6
-(2.4.+4.6)+3.5+3.5=-7+7=0
-7-5-4+10=-16+10=-6
- 2楼网友:你可爱的野爹
- 2021-03-31 15:37
1-4+3-0.5
解 原式=1+3-(4+0.5)
=4-4.5
=-0.5
-2.4+3.5-4.6+3.5
解 原式=2x3.5-(2.4+4.6)
=7-7
=0
(-7)-(+5)+(-4)-(-10)
解 原式=10-(7+5+4)
=10-16
=-6
3/4-2/7+(-1/6)-(-2/3)
解 原式=3/4-2/7-1/6+2/3
=3/4+2/3-(2/7+1/6)
=17/12-19/42
=119/84-38/84
=27/28
解 原式=1+3-(4+0.5)
=4-4.5
=-0.5
-2.4+3.5-4.6+3.5
解 原式=2x3.5-(2.4+4.6)
=7-7
=0
(-7)-(+5)+(-4)-(-10)
解 原式=10-(7+5+4)
=10-16
=-6
3/4-2/7+(-1/6)-(-2/3)
解 原式=3/4-2/7-1/6+2/3
=3/4+2/3-(2/7+1/6)
=17/12-19/42
=119/84-38/84
=27/28
- 3楼网友:千夜
- 2021-03-31 14:49
1. 1-4+3-0.5=1+3-4-0.5=4-4-0.5=-0.5
2. -2.4+3.5-4.6+3.5=-(4.6+2.4)+(3.5+3.5)=7-7=0
3. (-7)-(+5)+(-4)-(-10)=-7-5-4+10=-6
4. 3/4-2/7+(-1/6)-(-2/3)=3/4-2/7-1/6+2/3=3/4-2/7+(2/3-1/6)=(3/4+1/2)-2/7=5/4-2/7=27/28
2. -2.4+3.5-4.6+3.5=-(4.6+2.4)+(3.5+3.5)=7-7=0
3. (-7)-(+5)+(-4)-(-10)=-7-5-4+10=-6
4. 3/4-2/7+(-1/6)-(-2/3)=3/4-2/7-1/6+2/3=3/4-2/7+(2/3-1/6)=(3/4+1/2)-2/7=5/4-2/7=27/28
- 4楼网友:骨子里都是戏
- 2021-03-31 13:14
解:1-4+3-0.5
=(1+3)+[-4+(-0.5)]
=4+(-4.5)
=-(4.5-4)
=-0.5
-2.4+3.5-4.6+3.5
=[-2.4+(-4.6)]+(3.5+3.5)
=-7+7
=0
(-7)-(+5)+(-4)-(-10)
=(-7)+(-5)+(-4)+10
=-16+10
=-(16-10)
=-6
3/4-2/7+(-1/6)-(-2/3)
=3/4+(-2/7)+(-1/6)+2/3
=(3/4+2/3)+[-2/7+(-1/6)]
=17/12+(-19/42)
=17/12-19/42
=119/84-38/84
=27/28
=(1+3)+[-4+(-0.5)]
=4+(-4.5)
=-(4.5-4)
=-0.5
-2.4+3.5-4.6+3.5
=[-2.4+(-4.6)]+(3.5+3.5)
=-7+7
=0
(-7)-(+5)+(-4)-(-10)
=(-7)+(-5)+(-4)+10
=-16+10
=-(16-10)
=-6
3/4-2/7+(-1/6)-(-2/3)
=3/4+(-2/7)+(-1/6)+2/3
=(3/4+2/3)+[-2/7+(-1/6)]
=17/12+(-19/42)
=17/12-19/42
=119/84-38/84
=27/28
- 5楼网友:旧脸谱
- 2021-03-31 12:33
3\4-2\7+(-1\6)-(-2\3)
=3\4-2\7-1\6+2\3
=9\12-2\7-2\12+8\12
=15\12-2\7
=105\84-24\84
=81\84=27\28
=3\4-2\7-1\6+2\3
=9\12-2\7-2\12+8\12
=15\12-2\7
=105\84-24\84
=81\84=27\28
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