计算下列各式 (1)(2x+3y)(3x-2y) (2)(-3x)²-2(x-5)(x-2)
计算下列各式(1)(2x+3y)(3x-2y)(2)(-3x)²-2(x-5)(x-2)(3)(x+2)(x+3)-(x+6)(x-1)(4)(3x-2y)(2...
计算下列各式
(1)(2x+3y)(3x-2y)
(2)(-3x)²-2(x-5)(x-2)
(3)(x+2)(x+3)-(x+6)(x-1)
(4)(3x-2y)(2x+3y)-(x-3y)(3x+4y)
先化简再求值
8x²-(x-2)(3x+1)2(x+1)(x-5)其中x= -2 展开
(1)(2x+3y)(3x-2y)
(2)(-3x)²-2(x-5)(x-2)
(3)(x+2)(x+3)-(x+6)(x-1)
(4)(3x-2y)(2x+3y)-(x-3y)(3x+4y)
先化简再求值
8x²-(x-2)(3x+1)2(x+1)(x-5)其中x= -2 展开
1个回答
2015-03-15
展开全部
(1)=5x^2+5xy-6y^2
(2)=7x^2+14x-20
(3)=12
(4)=6x^2+5xy-6y^2-3x^2+5xy+12y^2=3x^2+10xy+6y^2
=6x^4-34x^3+14x^2+66x+20=312
(2)=7x^2+14x-20
(3)=12
(4)=6x^2+5xy-6y^2-3x^2+5xy+12y^2=3x^2+10xy+6y^2
=6x^4-34x^3+14x^2+66x+20=312
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