计算题:要过程,谢谢啦、、
3x²y(-2xy∧5)=??2a²(3a²-5b)=??(-2x²)(3ab²-5ab∧5)=??(5x+2y)(3x...
3x²y(-2xy∧5)=?? 2a²(3a²-5b)=??
(-2x²)(3ab²-5ab∧5)=?? (5x+2y)(3x-2y)=??
(3x+2)(y-4)-3(y-2)(y-3)=?? (-3)²008×(1/3)²009=??? 展开
(-2x²)(3ab²-5ab∧5)=?? (5x+2y)(3x-2y)=??
(3x+2)(y-4)-3(y-2)(y-3)=?? (-3)²008×(1/3)²009=??? 展开
2个回答
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3x²y(-2xy∧5)=-6x^3y^6 2a²(3a²-5b)=6a^4-10a^2b
(-2x²)(3ab²-5ab∧5)=-6x²ab²+10x²ab^5 (5x+2y)(3x-2y)=15x²-4xy-4y²(3x+2)(y-4)-3(y-2)(y-3)=3xy-12x+2y-8-3y²+15y-18=3xy-12x-3y²+17y-26 (-3)²008×(1/3)²009=9×0.08×1/9×0.09=0.08×0.09=0.0072
(-2x²)(3ab²-5ab∧5)=-6x²ab²+10x²ab^5 (5x+2y)(3x-2y)=15x²-4xy-4y²(3x+2)(y-4)-3(y-2)(y-3)=3xy-12x+2y-8-3y²+15y-18=3xy-12x-3y²+17y-26 (-3)²008×(1/3)²009=9×0.08×1/9×0.09=0.08×0.09=0.0072
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