括号五分之六加十五分之七括住乘六分之五等于多少用简便计算?
(6/5+7/15)x5/6
混合运算先计算括号内,或是拆项分别乘乘数
发现分别乘乘数比较容易计算
(6/5+7/15)x5/6
=6/5x 5/6+7/15x5/6
先约分前项用5及6 约分,后项用5约分
=1/1 x1/1+7/3x1/6
=1+ 7/3x1/6
=1+7/18
=1又7/18
简便计算
(6/5+7/15)×5/6
=6/5×5/6+7/15×5/6
=1+7/18
=1又7/18
(6/5+7/15)×5/6=6/5×5/6+7/15×5/6=1+7/18=1又7/15。主要是利用乘法分配律进行简便计算。
(6/5+7/15)*5/6
=6/5*5/6+7/15*5/6
=1+7/18
=1又7/18