x+120=5x 急,
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![x+120=5x 急,](/uploads/image/z/327374-62-4.jpg?t=x%2B120%3D5x+%E6%80%A5%2C)
x+120=5x 急,
x+120=5x 急,
x+120=5x 急,
120=5x-x
120=4x
x=30
x+120=5x
x-5x=-120
-4x=-120
x=-120/-4=30
这个很简单啊。
x+120=5x
120=5x-x
120=4x
可易解得 x=30
x+120=5x
x-5x=-120
-4x=-120
x=30
x=120/(5-1)
x=30
x+120=5x
5x-x=120
4x=120
x=120除以4
x=30
x+120=5x
移项得:4x=120
两边各除以4得:x=30