计算:(1)x²-(x三次y-2x²y²)÷xy (2)x(x+2)(x-2)-(x-4)(x²-1)(3)、(a-2b)²-2(a+b)(a-3b)(4)简便方法98²-97*99注明:这里每小题起码两步,
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![计算:(1)x²-(x三次y-2x²y²)÷xy (2)x(x+2)(x-2)-(x-4)(x²-1)(3)、(a-2b)²-2(a+b)(a-3b)(4)简便方法98²-97*99注明:这里每小题起码两步,](/uploads/image/z/6919780-4-0.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89x%26%23178%3B-%EF%BC%88x%E4%B8%89%E6%AC%A1y-2x%26%23178%3By%26%23178%3B%EF%BC%89%C3%B7xy+%282%29x%28x%2B2%29%28x-2%29-%28x-4%29%28x%26%23178%3B-1%29%283%29%E3%80%81%28a-2b%29%26%23178%3B-2%EF%BC%88a%2Bb%29%28a-3b%EF%BC%89%284%29%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%9598%26%23178%3B-97%2A99%E6%B3%A8%E6%98%8E%EF%BC%9A%E8%BF%99%E9%87%8C%E6%AF%8F%E5%B0%8F%E9%A2%98%E8%B5%B7%E7%A0%81%E4%B8%A4%E6%AD%A5%2C)
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计算:(1)x²-(x三次y-2x²y²)÷xy (2)x(x+2)(x-2)-(x-4)(x²-1)(3)、(a-2b)²-2(a+b)(a-3b)(4)简便方法98²-97*99注明:这里每小题起码两步,
计算:
(1)x²-(x三次y-2x²y²)÷xy (2)x(x+2)(x-2)-(x-4)(x²-1)
(3)、(a-2b)²-2(a+b)(a-3b)
(4)简便方法98²-97*99
注明:这里每小题起码两步,
计算:(1)x²-(x三次y-2x²y²)÷xy (2)x(x+2)(x-2)-(x-4)(x²-1)(3)、(a-2b)²-2(a+b)(a-3b)(4)简便方法98²-97*99注明:这里每小题起码两步,
(1)x²-(x三次y-2x²y²)÷xy
=x² - xy(x² - 2xy) ÷xy
=x² - (x² - 2xy)
=x² - x² + 2xy
=2xy
.
(2)x(x+2)(x-2)-(x-4)(x²-1)
=x(x²-4) - (x³-x-4x²+4)
=x³-4x² - x³+x+4x²-4
=x-4
.
(3)、(a-2b)²-2(a+b)(a-3b)
=a²-4ab+4b² - 2(a²-2ab-3b²)
=a²-4ab+4b² - 2a² +4ab+6b²
=-a²+10b²
(4)简便方法:
98²-97*99=98²- (98-1)*(98+1)=98²-(98²-1)=98²-98²+1=1