(1) [(-1/3)x²y][(3/4)y²-(1/2)x+(1/3)](2) 12x²y[(-2/3)x²-(5/6)xy+(3/4)y²](3) (4x²-y²)[(2x+y)²-(2x-y)²]注:“/”是分数线,1/2是二分之一
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(1)[(-1/3)x²y][(3/4)y²-(1/2)x+(1/3)](2)12x²y[(-2/3)x²-(5/6)xy+(3/4)y²](3)(4
(1) [(-1/3)x²y][(3/4)y²-(1/2)x+(1/3)](2) 12x²y[(-2/3)x²-(5/6)xy+(3/4)y²](3) (4x²-y²)[(2x+y)²-(2x-y)²]注:“/”是分数线,1/2是二分之一
(1) [(-1/3)x²y][(3/4)y²-(1/2)x+(1/3)]
(2) 12x²y[(-2/3)x²-(5/6)xy+(3/4)y²]
(3) (4x²-y²)[(2x+y)²-(2x-y)²]
注:“/”是分数线,1/2是二分之一
(1) [(-1/3)x²y][(3/4)y²-(1/2)x+(1/3)](2) 12x²y[(-2/3)x²-(5/6)xy+(3/4)y²](3) (4x²-y²)[(2x+y)²-(2x-y)²]注:“/”是分数线,1/2是二分之一
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