问题 解答题

用合理的方法计算

765×213÷27+765×327÷27

(2÷3+3÷7+5÷21)÷1/21÷0.28.

答案

(1)765×213÷27+765×327÷27

=(213+327)×765÷27,

=540×765÷27,

=540÷27×765,

=20×765,

=15300;

(2)(2÷3+3÷7+5÷21)×

1
21
÷0.28

=(

2
3
+
3
7
+
5
21
)×21÷0.28,

=(

2
3
×21+
3
7
×21+
5
21
×21)÷0.28,

=(14+9+5)÷0.28,

=28÷0.28,

=100.

单项选择题
单项选择题