99×89用简便方法计算脱式计算

Question

如题所述

Answer 1

99×89用简便方法计算脱式计算

99×89
=(100-1)×89
=100×89-89
=8900-89
=8811.

请采纳,谢谢.

Answer 2

等于100-1×89，括号100-1括号完了乘以89=100×89减掉89×1=8900减掉89=8811

Answer 3

99x89
=100x89-89
=8900-100+11
=8811