(1)计算：+．(2)解方程：-九年级数学

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• 解方程：。-九年级数学
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• 解方程：-八年级数学
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• 甲队修路120m与乙队修路100m所用天数相同，已知甲队比乙队每天多修10m，设甲队每天修路xm.依题意，下面所列方程正确的是A．B．C．D．-七年级数学
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• 李明到离家2.1千米的学校参加八年级联欢会，到学校时发现演出道具还放在家中，此时距联欢会开始还有42分钟，于是他立即步行（匀速）回家，在家拿道具用了1分钟，然后立即骑自-八年级数学
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• 解方程：-八年级数学
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