计算:1.2/m²-4-1/2m-4 解方程:1.x/x-1-2/x=1 2.1/x-2=3-x/2-x-3
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![计算:1.2/m²-4-1/2m-4 解方程:1.x/x-1-2/x=1 2.1/x-2=3-x/2-x-3](/uploads/image/z/5245554-66-4.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A1.2%2Fm%26%23178%3B-4-1%2F2m-4+%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9A1.x%2Fx-1-2%2Fx%3D1+2.1%2Fx-2%3D3-x%2F2-x-3)
计算:1.2/m²-4-1/2m-4 解方程:1.x/x-1-2/x=1 2.1/x-2=3-x/2-x-3
计算:1.2/m²-4-1/2m-4 解方程:1.x/x-1-2/x=1 2.1/x-2=3-x/2-x-3
计算:1.2/m²-4-1/2m-4 解方程:1.x/x-1-2/x=1 2.1/x-2=3-x/2-x-3
1.2/m²-4-1/2m-4
=2/(m+2)(m-2)-1/2(m-2)
=4/2(m+2)(m-2)-(m+2)/2(m+2)(m-2)
=(4-m-2)/2(m+2)(m-2)
=-1/2(m+2)
解方程:
1.x/x-1-2/x=1
两边乘以x(x-1)得
x²-2(x-1)=x(x-1)
x²-2x+2=x²-x
-x=-2
∴x=2
检验:x=2是方程的解
2.1/x-2=3-x/2-x-3
两边乘以(x-2)得
1=x-3-3(x-2)
2x=4
x=2
检验:x=2是增根
∴方程无解