数学题(2x-5y)(-2x-5y)用乘法公式做(写出过程)
问题描述:
数学题(2x-5y)(-2x-5y)用乘法公式做(写出过程)
答
(2x-5y)(-2x-5y)=-4x^2+10xy-10xy+25y^2=-4x^2+25y^2
答
(2x-5y)(-2x-5y)用乘法公式做(写出过程
=(2x-5y)(-2x-5y)
= (5y-2x) )5y+2x)
= 25y²-4x²