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计算help(1)(-1/2a^2b)(2/3b^2-1/3a+1/4)(2)(3x-1)(x+3)(3)(4x^2-2xy+y^2)(2x+y)
题目详情
计算 help
(1)(-1/2a^2b)(2/3b^2-1/3a+1/4)
(2)(3x-1)(x+3)
(3)(4x^2-2xy+y^2)(2x+y)
(1)(-1/2a^2b)(2/3b^2-1/3a+1/4)
(2)(3x-1)(x+3)
(3)(4x^2-2xy+y^2)(2x+y)
▼优质解答
答案和解析
(1)(-1/2a^2b)(2/3b^2-1/3a+1/4)
=-1/3a^2b^3+1/6a^3b-1/8a^2b
(2)(3x-1)(x+3)
=3x²+9x-x-3
=3x²+8x-3
(3)(4x^2-2xy+y^2)(2x+y)
=(2x)³+y³
=8x³+y³
=-1/3a^2b^3+1/6a^3b-1/8a^2b
(2)(3x-1)(x+3)
=3x²+9x-x-3
=3x²+8x-3
(3)(4x^2-2xy+y^2)(2x+y)
=(2x)³+y³
=8x³+y³
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