作业帮问几题数学题(初二的,不难)
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问几题数学题(初二的,不难)
(1)(9x^2+3x)/(x^2+6x+5) * (x^3+27)/(x^2-3x) ÷ (x^2-3x+9)/(x^2-9)
(2)化简:(x^2+7x+10)/(x^2+6x+5) * (x^3-x+1)/(x^2+4x+4) ÷ (x^2-x+1)/(x-2)
(3)已知1/a-1/b=4,求(a-2ab-b)/2a+7ab-2b)的值.
我的题目绝对没写错
(1)(9x^2+3x)/(x^2+6x+5) * (x^3+27)/(x^2-3x) ÷ (x^2-3x+9)/(x^2-9)
(2)化简:(x^2+7x+10)/(x^2+6x+5) * (x^3-x+1)/(x^2+4x+4) ÷ (x^2-x+1)/(x-2)
(3)已知1/a-1/b=4,求(a-2ab-b)/2a+7ab-2b)的值.
我的题目绝对没写错
(1)(9x^2+3x)/(x^2+6x+5) * (x^3+27)/(x^2-3x) ÷ (x^2-3x+9)/(x^2-9) =3x(3x+1)/(x+5)(x+1) × (x+3)(x^2-3x+9)/x(x-3) × (x+3)(x-3)/(x^2-3x+9)=3(3x+1)(x+3)^2/(x+5)(x+1)你题目没有写错吗?(2)化简:(x^2+7x+10)/...