很着急!四道初一数学计算题(1)(8x³-12x²+16x)÷(-4x) (2)[3(m+n)(m-n)+(1)(8x³-12x²+16x)÷(-4x)(2)[3(m+n)(m-n)+(m-n)²-2nm-n)]÷(4m)(3)(3x²y-2xy+2xy²)÷(xy)(4)[(a+b)(a-b)-(a+b)²]÷(a+b)
问题描述:
很着急!四道初一数学计算题(1)(8x³-12x²+16x)÷(-4x) (2)[3(m+n)(m-n)+
(1)(8x³-12x²+16x)÷(-4x)
(2)[3(m+n)(m-n)+(m-n)²-2nm-n)]÷(4m)
(3)(3x²y-2xy+2xy²)÷(xy)
(4)[(a+b)(a-b)-(a+b)²]÷(a+b)
答
-2X2+3X-4
m-n-(2n2+n)/(4m)
3x+2y-2
-2b
答
(1)(8x³-12x²+16x)÷(-4x) = -2x²+3x-4
(2)[3(m+n)(m-n)+(m-n)²-2nm-n)]÷(4m) = m-n-(2n²+n)÷(4m)
(3)(3x²y-2xy+2xy²)÷(xy) = 3x-2+2y
(4)[(a+b)(a-b)-(a+b)²]÷(a+b) = -2b
答
1.(8x³-12x²+16x)÷(-4x)=-(8x³-12x²+16x)/(4x)=-(2x²-3x+4)=-2x²+3x-42.[3(m+n)(m-n)+(m-n)²-2nm-n)]÷(4m)=(3m²-3n²+m²-2mn+n²-2nm+n)/4m=(4m²-4...