作业帮283+284+285+286+287等于几乘几等于几
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283+284+285+286+287等于几乘几等于几
283+284+285+286+287等于几乘几等于几
283+284+285+286+287等于几乘几等于几
283+284+285+286+287
=（283+287）+（284+286）+285
=285X2+285X2+285
=285X5
=1425
285乘5=1425
285×5＝1425