初中数学题,求解答!计算要减括号! 谢谢。答后会给悬赏!
1.如果a=-1/4,b=-2,c=-23/4,那么|a|+|b|-|c|=()2.+0.125+(+31/4)+(-31/8)-1/8-(-1/4)3.3.75-[(-...
1.如果a=-1/4,b=-2,c=-2 3/4,那么|a|+|b|-|c|=()
2. +0.125+(+3 1/4)+(-3 1/8)-1/8-(-1/4)
3. 3.75-[(-3/8)+(-1/2)-(-5/6)+4 2/3]-0.125
4. (-1 1/2)-1 1/4+(-2 1/2)-(-3 3/4)-(-1 1/4)
5. 1-5/12+4/15+1/12-14/15-1 19/20 展开
2. +0.125+(+3 1/4)+(-3 1/8)-1/8-(-1/4)
3. 3.75-[(-3/8)+(-1/2)-(-5/6)+4 2/3]-0.125
4. (-1 1/2)-1 1/4+(-2 1/2)-(-3 3/4)-(-1 1/4)
5. 1-5/12+4/15+1/12-14/15-1 19/20 展开
4个回答
展开全部
1.如果a=-1/4,b=-2,c=-2 3/4,那么|a|+|b|-|c|=(-1/2)
2. +0.125+(+3 1/4)+(-3 1/8)-1/8-(-1/4)
=1/8+3又1/4-3又1/8-1/8+1/4
=3又1/4+1/4+1/8-1/8-3又1/8
=3又1/2--3又1/8
=3.5-3.125
=0.375
3. 3.75-[(-3/8)+(-1/2)-(-5/6)+4 2/3]-0.125
=3.75+3/8+1/2-5/6-4 2/3-0.125
=3.75+0.375+0.5-5/6--4 2/3-0.125
=4.5-5/6--4 2/3
=4.5-10.5
=-6
4. (-1 1/2)-1 1/4+(-2 1/2)-(-3 3/4)-(-1 1/4)
=(-1 1/2) +(-2 1/2)-1 1/4+1 1/4+3 3/4
=-4+3 3/4
=-1/4
5. 1-5/12+4/15+1/12-14/15-1 19/20
=1-5/12+1/12+4/15-14/15-1 19/20
=1-1 19/20-1/3-2/5
=-19/20-11/15
=-57/60-44/60
=-1 41/60
2. +0.125+(+3 1/4)+(-3 1/8)-1/8-(-1/4)
=1/8+3又1/4-3又1/8-1/8+1/4
=3又1/4+1/4+1/8-1/8-3又1/8
=3又1/2--3又1/8
=3.5-3.125
=0.375
3. 3.75-[(-3/8)+(-1/2)-(-5/6)+4 2/3]-0.125
=3.75+3/8+1/2-5/6-4 2/3-0.125
=3.75+0.375+0.5-5/6--4 2/3-0.125
=4.5-5/6--4 2/3
=4.5-10.5
=-6
4. (-1 1/2)-1 1/4+(-2 1/2)-(-3 3/4)-(-1 1/4)
=(-1 1/2) +(-2 1/2)-1 1/4+1 1/4+3 3/4
=-4+3 3/4
=-1/4
5. 1-5/12+4/15+1/12-14/15-1 19/20
=1-5/12+1/12+4/15-14/15-1 19/20
=1-1 19/20-1/3-2/5
=-19/20-11/15
=-57/60-44/60
=-1 41/60
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