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计算b/a(a+b)-c/(a+b)(a+b+c)-d/(a+b+c)(a+b+c+d)=
题目详情
计算 b/a(a+b)-c/(a+b)(a+b+c)-d/(a+b+c)(a+b+c+d)=
▼优质解答
答案和解析
b/a(a+b)+c/(a+b)(a+b+c)+d/(a+b+c)(a+b+c+d)
=1/a-1/(a+b)+1/(a+b)-1/(a+b+c)+1/(a+b+c)-1/(a+b+c+d)
=1/a-1/(a+b+c+d)
=(b+c+d)/a(a+b+c+d)
=1/a-1/(a+b)+1/(a+b)-1/(a+b+c)+1/(a+b+c)-1/(a+b+c+d)
=1/a-1/(a+b+c+d)
=(b+c+d)/a(a+b+c+d)
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