计算下列各题:[2/3x²-2/(x²+y²)乘以(x²+y²)/3x
计算下列各题:[2/3x²-2/(x²+y²)乘以(x²+y²)/3x
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
1.计算:x-y分之x+y + y-3分之2x 2.计算:x+3分之x²-x-2 除以 (2-x) + x+3
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数学用乘法公式计算(x+y+1)(x+y-1)(2x-y-3)²
(x-y)·2(x-y)²·3(x-y)³ 计算
(x-y)X(2x-2y)²X(3x-3y)²
计算(2x-3y)²-(4y-3x)(4y+3x) (x+3)²-2(x+5)(x+1)+(x-2)
计算:【[2/(3x)-2/(x+y)×[(x+y/(3x)-x²-xy)]】÷(x-y)/x
计算x²-4/x²-x-2 乘以 x²-x/x²+3x+2