-2a三次方+12a²-18a=?
[(x+y)²-(x-y)²]÷(2xy)=?[5xy²(x²-3xy)+(3x²y²)三次方]÷(5xy)²=?
人气:192 ℃ 时间:2020-01-29 07:13:32
解答
[(x+y)²-(x-y)²]÷(2xy)=[(x²+2xy+y²)-(x² -2xy+y² )]÷(2xy)=(4xy)÷(2xy)=2 [5xy²(x²-3xy)+(3x²y²)^3]÷(5xy)²=[5x^3y^2-15x^2y^3+27x^6y^6]/(25x...
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