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)×
÷0.281 21
=(
+2 3
+3 7
)×21÷0.28,5 21
=(
×21+2 3
×21+3 7
×21)÷0.28,5 21
=(14+9+5)÷0.28,
=28÷0.28,
=100.