数学题目~~计算题~~急

问题描述:

数学题目~~计算题~~急
(1)5a²b(x-y)的三次方-30ab²(y-x)²
(2)a²-(b²+c²-2ac)
(3)x²(x²-y²)+z²(y²-x²)

(1)5a²b(x-y)的三次方-30ab²(y-x)²=5a²b(x-y)的三次方-30ab²(x-y)²=(x-y)²【5a²b(x-y)-30ab²】=(x-y)²*5ab*【a(x-y)-6b】(2)a²-(b²+c²-2ac)=a...