x-120=2乘以(x-200)
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x-120=2乘以(x-200)
x-120=2乘以(x-200)
x-120=2乘以(x-200)
方法①:x-120=2×(x-200)
x-120=2x-400
x=2x-400+120
x=2x-280
2x-x=280
x=280
方法②:x-120=2×(x-200)
x-120=2x-400
2x-x=-120+400
x=280
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x-120=2乘以(x-200)
x-120=2x-400
2x-x=-120+400
x=280
x-120=2乘以(x-200)
x-120=2x-400
x=2x-400+120
x=2x-280
2x-x=280
x=280
x-120=2乘以(x-200)
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