计算:(1)(-2x)³·(7x²y) (2)(3a²b-6ab²)÷(a-2b)解下列方程(组):(1)﹛2x+y=23;4x-y=19 (2)x/x-3)-2=3/x-3
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![计算:(1)(-2x)³·(7x²y) (2)(3a²b-6ab²)÷(a-2b)解下列方程(组):(1)﹛2x+y=23;4x-y=19 (2)x/x-3)-2=3/x-3](/uploads/image/z/759200-32-0.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%88-2x%29%26%23179%3B%C2%B7%287x%26%23178%3By%29+%282%29%283a%26%23178%3Bb-6ab%26%23178%3B%29%C3%B7%28a-2b%29%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%EF%BC%88%E7%BB%84%EF%BC%89%EF%BC%9A%EF%BC%881%EF%BC%89%EF%B9%9B2x%2By%3D23%3B4x-y%3D19+%282%29x%2Fx-3%29-2%3D3%2Fx-3)
计算:(1)(-2x)³·(7x²y) (2)(3a²b-6ab²)÷(a-2b)解下列方程(组):(1)﹛2x+y=23;4x-y=19 (2)x/x-3)-2=3/x-3
计算:(1)(-2x)³·(7x²y) (2)(3a²b-6ab²)÷(a-2b)
解下列方程(组):(1)﹛2x+y=23;4x-y=19 (2)x/x-3)-2=3/x-3
计算:(1)(-2x)³·(7x²y) (2)(3a²b-6ab²)÷(a-2b)解下列方程(组):(1)﹛2x+y=23;4x-y=19 (2)x/x-3)-2=3/x-3
(1)(-2x)³·(7x²y)
=-8x³ * 7x²y
= -56x^5 y
(2)(3a²b-6ab²)÷(a-2b)
=3ab(a-2b)÷(a-2b)
=3ab
解下列方程(组):
(1)﹛2x+y=23;4x-y=19
两式相加,
6x=42
x=7
y=9
(2)x/x-3)-2=3/x-3
x-2(x-3)=3
-x=-3
x=3
分式的分母为零,分式无意义.