1 (2x-3y)^2(2x+3y)^2 2 (2x+y-1)(2x+y+y) 3 (2+xy)(xy-2)-(-2+x
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1 (2x-3y)^2(2x+3y)^2 2 (2x+y-1)(2x+y+y) 3 (2+xy)(xy-2)-(-2+xy)^2 4 (a+3b)^2-(2a-3b)(3b+2a)
麻烦给详解
麻烦给详解
1.(2x-3y)^2(2x+3y)^2
=[(2x-3y)(2x+3y)]^2
=(4x^2-9y^2)^2
=16x^4-72x^2y^2+81y^4
2.(2x+y-1)(2x+y+y)题目是不是打错了 应该是(2x+y-1)(2x+y+1)吧
=(2x+y)^2-1
=4x^2+4xy+y^2-1
3.(2+xy)(xy-2)-(-2+xy)^2
=(x^2y^2-4)-(x^2y^2-4xy+4)
=x^2y^2-4-x^2y^2+4xy-4
=4xy-8
4.(a+3b)^2-(2a-3b)(3b+2a)
=a^2+6ab+9b^2-4a^2+9b^2
=18b^2-3a^2+6ab
挺费事的.
=[(2x-3y)(2x+3y)]^2
=(4x^2-9y^2)^2
=16x^4-72x^2y^2+81y^4
2.(2x+y-1)(2x+y+y)题目是不是打错了 应该是(2x+y-1)(2x+y+1)吧
=(2x+y)^2-1
=4x^2+4xy+y^2-1
3.(2+xy)(xy-2)-(-2+xy)^2
=(x^2y^2-4)-(x^2y^2-4xy+4)
=x^2y^2-4-x^2y^2+4xy-4
=4xy-8
4.(a+3b)^2-(2a-3b)(3b+2a)
=a^2+6ab+9b^2-4a^2+9b^2
=18b^2-3a^2+6ab
挺费事的.
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
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化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
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计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算3xy[2xy-x(y-2)+x-1]
(x^2+xy/x-y)/(xy/x-y)计算
(xy-x^2)乘以(xy)/(x-y)
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