计算:(1).(-2xy²)*(3x²y)²(1).(-2xy²)*(3x²y)²;(2).(-a)²(2-3ab);(3).(x+2y)(2x-y);(4).(a-2b)(a+2b);(5).(2a+1)²;(6).(a-3b)²快呀,在线等待30分钟
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![计算:(1).(-2xy²)*(3x²y)²(1).(-2xy²)*(3x²y)²;(2).(-a)²(2-3ab);(3).(x+2y)(2x-y);(4).(a-2b)(a+2b);(5).(2a+1)²;(6).(a-3b)²快呀,在线等待30分钟](/uploads/image/z/6900484-4-4.jpg?t=%E8%AE%A1%E7%AE%97%3A%281%29.%28-2xy%26sup2%3B%29%2A%283x%26sup2%3By%29%26sup2%3B%281%29.%28-2xy%26sup2%3B%29%2A%283x%26sup2%3By%29%26sup2%3B%3B%282%29.%28-a%29%26sup2%3B%282-3ab%29%3B%283%29.%28x%2B2y%29%282x-y%29%3B%284%29.%28a-2b%29%28a%2B2b%29%3B%285%29.%282a%2B1%29%26sup2%3B%3B%286%29.%28a-3b%29%26sup2%3B%E5%BF%AB%E5%91%80%2C%E5%9C%A8%E7%BA%BF%E7%AD%89%E5%BE%8530%E5%88%86%E9%92%9F)
计算:(1).(-2xy²)*(3x²y)²(1).(-2xy²)*(3x²y)²;(2).(-a)²(2-3ab);(3).(x+2y)(2x-y);(4).(a-2b)(a+2b);(5).(2a+1)²;(6).(a-3b)²快呀,在线等待30分钟
计算:(1).(-2xy²)*(3x²y)²
(1).(-2xy²)*(3x²y)²;(2).(-a)²(2-3ab);(3).(x+2y)(2x-y);(4).(a-2b)(a+2b);(5).(2a+1)²;(6).(a-3b)²
快呀,在线等待30分钟
计算:(1).(-2xy²)*(3x²y)²(1).(-2xy²)*(3x²y)²;(2).(-a)²(2-3ab);(3).(x+2y)(2x-y);(4).(a-2b)(a+2b);(5).(2a+1)²;(6).(a-3b)²快呀,在线等待30分钟
(1).(-2xy²)*(3x²y)²
=(-2xy²)*(9x^4y²)
=-18x^5y^4
(2).(-a)²(2-3ab)
=a²(2-3ab)
=2a²-3a³b
(3).(x+2y)(2x-y)
=x(2x-y)+2y(2x-y)
=2x²-xy+4xy-2y²
=2x²+3xy-2y²
(4).(a-2b)(a+2b)
=a²-(2b)²
=a²-4b²
(5).(2a+1)²
=(2a)²+2×2a×1+1²
=4a²+4a+1
(6).(a-3b)²
=a²-2a×3b+(3b)²
=a²-6ab+9b²
(1)
原式
=-18x^5*y^4
(2)
原式
=2a²-3a³b
(3)
原式
=2x²+3xy-2y²
(4)
原式
=a²-4b²
(5)
原式
=4a²+4a+1
(6)
原式
=a²-6ab+9b²
(-2xy²)*(3x²y)²=-18x^5y^4
.(-a)²(2-3ab)=2a^2-3a^3b
(x+2y)(2x-y)=2x^2+3xy-2y^2
(a-2b)(a+2b)=a^2-4b^2
(2a+1)²=4a^2+4a+1
.(a-3b)²=a^2-6ab+9b^2
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