-1/2(x+y)+1/4(p+q)等于多少

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-1/2(x+y)+1/4(p+q)等于多少

-1/2(x+y)+1/4(p+q)等于多少
-1/2(x+y)+1/4(p+q)等于多少

-1/2(x+y)+1/4(p+q)等于多少
乘法分配律
=-1/2x-1/2y+1/4p+1/4q