(1)4x^2+3y-3xy-4x(2) -(a^2-b^2)^2+(a^2+b^2)(a+b)^2(3)-2.89×52^2+2.89×48^2 (这题是用因式分解计算,要结果)抱歉第二题是-(a^2-b^2)^2+2(a^2+b^2)(a+b)^2
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(1)4x^2+3y-3xy-4x(2) -(a^2-b^2)^2+(a^2+b^2)(a+b)^2(3)-2.89×52^2+2.89×48^2 (这题是用因式分解计算,要结果)抱歉第二题是-(a^2-b^2)^2+2(a^2+b^2)(a+b)^2
(1)4x^2+3y-3xy-4x
(2) -(a^2-b^2)^2+(a^2+b^2)(a+b)^2
(3)-2.89×52^2+2.89×48^2 (这题是用因式分解计算,要结果)
抱歉第二题是-(a^2-b^2)^2+2(a^2+b^2)(a+b)^2
(1)4x^2+3y-3xy-4x(2) -(a^2-b^2)^2+(a^2+b^2)(a+b)^2(3)-2.89×52^2+2.89×48^2 (这题是用因式分解计算,要结果)抱歉第二题是-(a^2-b^2)^2+2(a^2+b^2)(a+b)^2
1 4x^2+3y-3xy-4x=4x(x-1)-3y(x-1)=(x-1)(4x-3y)
2 -(a^2-b^2)+(a^2+b^2)(a+b)^2=-(a+b)^2(a-b)^2+(a^2+b^2)(a+b)^2
=(a+b)^2[(-a^2-b^2+2ab)+(a^2+b^2)]
=2ab(a+b)^2
3 -2.89(52^2-48^2)
=-2.89(52+48)(52-48)
=-289*4
=-1156
1.4x(x-1)+3y(1-x)=(x-1)(4x-3y)
2.(a^2+b^2)(a+b)^2-(a+b)^2(a-b)^2=2ab(a+b)^2
3.2.89(48^2-52^2)=2.89(48+52)(48-52)=-1156
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