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+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