因式分解:化简求值:(1).3y²-5xy-2y(2).x³-5x²+6x(3).a²+2a+1-b²(4).(x²-2x)²+2(x²-2x)+1化简并求值:(2a+b)²-(3a-b)²+5a(a-b),其中a=1,b=五分之一
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![因式分解:化简求值:(1).3y²-5xy-2y(2).x³-5x²+6x(3).a²+2a+1-b²(4).(x²-2x)²+2(x²-2x)+1化简并求值:(2a+b)²-(3a-b)²+5a(a-b),其中a=1,b=五分之一](/uploads/image/z/2688413-5-3.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%881%EF%BC%89.3y%26%23178%3B-5xy-2y%EF%BC%882%EF%BC%89.x%26%23179%3B-5x%26%23178%3B%2B6x%EF%BC%883%EF%BC%89.a%26%23178%3B%2B2a%2B1-b%26%23178%3B%EF%BC%884%EF%BC%89.%EF%BC%88x%26%23178%3B-2x%EF%BC%89%26%23178%3B%2B2%EF%BC%88x%26%23178%3B-2x%EF%BC%89%2B1%E5%8C%96%E7%AE%80%E5%B9%B6%E6%B1%82%E5%80%BC%EF%BC%9A%EF%BC%882a%2Bb%EF%BC%89%26%23178%3B-%EF%BC%883a-b%EF%BC%89%26%23178%3B%2B5a%EF%BC%88a-b%EF%BC%89%2C%E5%85%B6%E4%B8%ADa%3D1%2Cb%3D%E4%BA%94%E5%88%86%E4%B9%8B%E4%B8%80)
因式分解:化简求值:(1).3y²-5xy-2y(2).x³-5x²+6x(3).a²+2a+1-b²(4).(x²-2x)²+2(x²-2x)+1化简并求值:(2a+b)²-(3a-b)²+5a(a-b),其中a=1,b=五分之一
因式分解:化简求值:
(1).3y²-5xy-2y
(2).x³-5x²+6x
(3).a²+2a+1-b²
(4).(x²-2x)²+2(x²-2x)+1
化简并求值:
(2a+b)²-(3a-b)²+5a(a-b),其中a=1,b=五分之一
因式分解:化简求值:(1).3y²-5xy-2y(2).x³-5x²+6x(3).a²+2a+1-b²(4).(x²-2x)²+2(x²-2x)+1化简并求值:(2a+b)²-(3a-b)²+5a(a-b),其中a=1,b=五分之一
(1).3y²-5xy-2y=(3x+y)(x-2y)
(2).x³-5x²+6x=x(x-2)(x-3)
(3).a²+2a+1-b²=(a+1)²-b²=(a+b+1)(a-b+1)
(4).(x²-2x)²+2(x²-2x)+1=[(x²-2x)+1]²=[(x-1)²]²=(x-1)^4
化简并求值:
(2a+b)²-(3a-b)²+5a(a-b),其中a=1,b=五分之一
(2a+b)²-(3a-b)²+5a(a-b)
=4a²+4ab+b²-(9a²-6ab+b²)+5a²-5ab
=5ab
=5×1×1/5
=1