-4a^2x^2+12ax-9=?4(x+y)^2-12(x+y)+9=?x^2+2x(y-z)+(z-y)^2=?(1/8a^3b^2c-4a^2b^3)(2a^2bc)^3=?
问题描述:
-4a^2x^2+12ax-9=?4(x+y)^2-12(x+y)+9=?x^2+2x(y-z)+(z-y)^2=?(1/8a^3b^2c-4a^2b^3)(2a^2bc)^3=?
(a-1/2b)^2+(a+1/2b)^2=?
答
1、-4a²x²+12ax-9=-(4a²x²-12ax+9)=-(2ax+3)²2、4(x+y)²-12(x+y)+9=[2(x+y)-3]²=(2x+2y-3)²3、x²+2x(y-z)+(z-y)²=x²+2x(y-z)+(y-z)²...