计算:[(2a+b)(2a-b)-4(a-2b)²+4b(a-2b)]÷(-4b)[(-3mn)²×m³-2m³(3mn²)³×½n]÷(-3m³n)²解方程:x(9x-5)-(3x-1)(3x+1)=56x+7(2x+3)(2x-3)-28(x-½)(x+½)=4

问题描述:

计算:[(2a+b)(2a-b)-4(a-2b)²+4b(a-2b)]÷(-4b)
[(-3mn)²×m³-2m³(3mn²)³×½n]÷(-3m³n)²
解方程:x(9x-5)-(3x-1)(3x+1)=5
6x+7(2x+3)(2x-3)-28(x-½)(x+½)=4