999×8+111×28 简便计算
=111x9x8+111x28
=111x72+111x28
=111x(72+28)
=111x100
=11100
999×8+111×28 怎样用简便方法计算?(四年级)
答﹕=111×9×8+111×28
=111×72+111×28
=111×(72+28)
=111×100
=11100
想﹕999是111的倍数,所以,把999看成111×9,那么,利用乘法分配律,就能算出来了。
999×8+111×28 简便计算 =111x9x8+111x28 =111x72+111x28 =111x(72+28) =111x100 =11100
解答:
999×8+111×28
=111×9×8+111×28
=111×(9×8)+111×28
=111×72+111×28
=111×(72+28)
=111×100
=11100