214-(86-14)
=214-72
=142
这就是简便运算方法。
解:214一(86一14)等于( 142 )
∵已知需求出214一(86一14)等于多少
X - (Y - Z)= X - Y + Z
∴214一(86一14)
= 214 - 86 + 14
= ( 200 + 14)- (100 - 14)+ 14
= 200 + 14 - 100 + 14 + 14
= ( 200 - 100)+ (14 + 14 + 14)
= 100 + (28 + 14)
= 100 + 42
= 142
答:214一(86一14)等于142
去括号,然后交换
=214-86-14
=214-14-86
=200-86
=114
把括号去掉即可,
214-86+14
=214-100+14+14
=114+28
=142
首先去括号
214-(86-14)
=214-86-14
=214-14-86
=200-86
=114