2(x-1)=4x-7列方程,急,
问题描述:
2(x-1)=4x-7列方程,急,
答
2(x-1)=4x-7
去括号得:2x-2=4x-7
移项的:7-2=4x-2x
即:5=2x
x=2.5
答
2(x-1)=4x-7
2x-2=4x-7(去括号法则)
2x-4x=-7+2(移项)
-2x=-5
x=2.5
答
2x-2=4x-7. 2x-4x=-7+2. -2x=-5. X=5/2
答
2(x-1)=4x-7
2x-2=4x-7
-2x=-5
x= 5/2
答
2(x-1)=4x-7
2x-2=4x-7
2x-2+7=4x
4x-2x=5
2x=5
x=2.5
答
2x-2=4x-7
:-2x=5
:x=-5/2
答
去括号,得
2x-2=4x-7
移项,得
2x-4x= -7+2
即 -2x= -5
解得x=5/2