实在不想算了!能写多少写多少!要有准确率!(-2x+3y)²(a+2)(a-2)(a²+4)若(x-2)(x+4)=x²-ax-b,则a= ,b= .(x+7)(x-6)-(x-2)(x+1)(x-2y)²-(2x-y)(x+y)解方程:4(x-2)(x+5)

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实在不想算了!能写多少写多少!要有准确率!(-2x+3y)²(a+2)(a-2)(a²+4)若(x-2)(x+4)=x²-ax-b,则a=       ,b=         .(x+7)(x-6)-(x-2)(x+1)(x-2y)²-(2x-y)(x+y)解方程:4(x-2)(x+5)

实在不想算了!能写多少写多少!要有准确率!(-2x+3y)²(a+2)(a-2)(a²+4)若(x-2)(x+4)=x²-ax-b,则a= ,b= .(x+7)(x-6)-(x-2)(x+1)(x-2y)²-(2x-y)(x+y)解方程:4(x-2)(x+5)
实在不想算了!能写多少写多少!要有准确率!
(-2x+3y)²

(a+2)(a-2)(a²+4)
若(x-2)(x+4)=x²-ax-b,则a=       ,b=         .
(x+7)(x-6)-(x-2)(x+1)
(x-2y)²-(2x-y)(x+y)
解方程:4(x-2)(x+5)-(2x-3)(2x+1)=5

实在不想算了!能写多少写多少!要有准确率!(-2x+3y)²(a+2)(a-2)(a²+4)若(x-2)(x+4)=x²-ax-b,则a= ,b= .(x+7)(x-6)-(x-2)(x+1)(x-2y)²-(2x-y)(x+y)解方程:4(x-2)(x+5)
1.4x²+9y²-12xy
2.a^4-16
3.a=-2,b=8
4.2x+44
5.5y²-5xy-x²
6.x=21/8