有理数的加减混合运算 要怎么做才很熟练讲解一下
-2.5+(-1/5)0.4-(-1/4)+1/61/3-(-5/6)+2/31/3+(-1/5)+1+2/327-18+(-7)-320.5+(-1/4)-(-2.75...
-2.5+(-1/5)
0.4-(-1/4)+1/6
1/3-(-5/6)+2/3
1/3+(-1/5)+1+2/3
27-18+(-7)-32
0.5+(-1/4)-(-2.75)+1/2 展开
0.4-(-1/4)+1/6
1/3-(-5/6)+2/3
1/3+(-1/5)+1+2/3
27-18+(-7)-32
0.5+(-1/4)-(-2.75)+1/2 展开
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