(ab²+a²b)÷(a+b)=(x²-49)÷(7-x)=(1/4乘以x²-x+1)÷(1-1/2乘以x)=

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(ab²+a²b)÷(a+b)=
(x²-49)÷(7-x)=
(1/4乘以x²-x+1)÷(1-1/2乘以x)=

(ab²+a²b)÷(a+b)=ab
(x²-49)÷(7-x)=-x-7
(1/4乘以x²-x+1)÷(1-1/2乘以x)=1-1/2乘以x