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2m-100mm-2cm+0.2m-0.1m等于多少

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2m-100mm-2cm+0.2m-0.1m等于多少
2m-100mm-2cm+0.2m-0.1m等于多少
2m-100mm-2cm+0.2m-0.1m
=2m -0.1m -0.02m +0.2m -0.1m
=1.98m
=198cm
再问: {5x+4y=7 {7x+3y=15 怎么算