5乘以8×98简便运算899＋344简便运算 12 - 知识问答

5乘以8×98简便运算899＋344简便运算 1248÷24简便运算

1个回答

5×8×98
=40×98
=40×(100-2)
=40×100-40×2
=4000-80
=3920
899＋344
=(900-1)+344
=(900+343)+(1-1)
=1243

相关问题