Question

使用提取公因数计算89×35+89×64+89(第等式)？

Answer 1

公因数都是89
用乘法分配律
89x（35+64+1）
= 89x100
= 8900

Answer 2

89×35+89×64+89
=89×35+89×64+89×1
=89×(35+64+1)
=89×100
=8900