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21乘14加85乘21简便计算

66×21+19×21+85×19能不能简便计算能怎么算66×21+19×21+85×19=(66+19)×21+85×19=85×(21+19)=85×40=3400

66乘21加19乘21加85乘19简便计算回答:66*21+19*21+85*19=21*(66+19)+85*19=21*85+85*19=85*(21+19)=85*40=3400

25×5 8×35 21×20 14×40,怎样简便计算?简便计算25×5 +8×35 +21×20+ 14×40=125+20x14+20x21+20x28=125+20x(14+21+28)=125+20x63=125+1260=1385 抢首赞 已赞过

5×21×8的简便方法?简便计算过程方法如下 解:5×21×8 =(5×8)×21 =40×21 =840

用简便方法计算下面各题.(1)66×21+19×21+85×19(2解答:解:(1)66×21+19×21+85×19,=(66+19)×21+85×19,=85×21+85×19,=85×(

简便怎么算?回答:3/5×(1/7+8/21+2/3) =3/5x(3/21 +8/21 + 14/21) =3/5x 25/21 =(1x5)/(1x7) =5

66乘21加19乘21加85乘19 怎样简便计算?66*21+19*21+85*19 = (66+19)*21+85*19 = 85*21+85*19 = 85*(21+19) = 85*40 = 3400

20.18-14.8 0.99-5.2的简便计算?简便计算20.18-14.8+0.99-5.2 解题思路:不能进行简便运算的按顺序计算,简便运算核心是运用加法和乘法各种定律进行计算

28÷14简便方法怎么?28÷14简便方法怎么算把2.8乘于10,然后把计算结果再除于10,简便方法就是28/14=2,答案等于0.2

简便计算:20又21/20乘2120 又21/20乘21=(20+21分之20)× 21=20×21+20=420+20=440

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