(-1/7)+( -2/35 )-(-2/5) 1/2+(-2/3)-(-4/5)+(-1/2) = =
题目
(-1/7)+( -2/35 )-(-2/5) 1/2+(-2/3)-(-4/5)+(-1/2) = =
答案
(-1/7)+( -2/35 )-(-2/5) =-5/35-2/35+14/35 =-7/35 =-1/5 1/2+(-2/3)-(-4/5)+(-1/2) =1/2-1/2-2/3+4/5 =-2/3+4/5 =-10/15+12/15 =2/15
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