(-1又1/2)-(-12又4/7)+(-5又1/5)-3又4/5+12又3/7 过程! 0-1.4+1.1-8.7+9 -1/2-1/2+2/3-1/4+1/3
-11又1/2-15+5又1/5-4又1/5+11又1/20-1.4+1.1-8.7+9-1/2-1/2+2/3-1/4+1/3...
-11又1/2-15+5又1/5-4又1/5+11又1/2
0-1.4+1.1-8.7+9
-1/2-1/2+2/3-1/4+1/3 展开
0-1.4+1.1-8.7+9
-1/2-1/2+2/3-1/4+1/3 展开
4个回答
展开全部
(-1又1/2)-(-12又4/7)+(-5又1/5)-3又4/5+12又3/7 !
=-3/2+12又4/7+12又3/7-(5又1/5+3又4/5)
=-3/2+(12+(4/7+3/7))-(5+(1/5+4/5))
=-3/2+13-6=-3/2+14/2=11/2
0-1.4+1.1-8.7+9 -1/2-1/2+2/3-1/4+1/3
=-1.4+1.1-8.7+9-(1/2+1/2)+(2/3+1/3)-1/4
=-0.3-8.7+9-1+1-1/4
=0-1/4=-1/4
-11又1/2-15+5又1/5-4又1/5+11又1/2
=(-11又1/2+11又1/2)-15+(5+1/5-4-1/5)
=0-15+1=-14
=-3/2+12又4/7+12又3/7-(5又1/5+3又4/5)
=-3/2+(12+(4/7+3/7))-(5+(1/5+4/5))
=-3/2+13-6=-3/2+14/2=11/2
0-1.4+1.1-8.7+9 -1/2-1/2+2/3-1/4+1/3
=-1.4+1.1-8.7+9-(1/2+1/2)+(2/3+1/3)-1/4
=-0.3-8.7+9-1+1-1/4
=0-1/4=-1/4
-11又1/2-15+5又1/5-4又1/5+11又1/2
=(-11又1/2+11又1/2)-15+(5+1/5-4-1/5)
=0-15+1=-14
追问
-1/2-1/2+2/3-1/4+1/3
追答
-1/2-1/2+2/3-1/4+1/3
=-1+(2/3+1/3)-1/4=-1+1-1/4=-1/4
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展开全部
第一个应该是=(-11又1/2+11又1/2)+(5又1/5-4又1/5)-15
=0+1-15
=-14
=0+1-15
=-14
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