看到这类题,一般首先要想到的就是乘法分配律,要找出同一个数a,
原式=78*148-13*5*6*6
=78*148-78*30
乘法分配律
78*(148-30)
=78*118
再来一次乘法分配律
=78*(100+10+8)
=78*100+78*10+78*8
答案自己算一下
=(70+8)*148-(70-5)*36
=70*148+8*148-70*36+5*36
=70(148-36)+(10-2)*148+180
=70*112+1480-296+180
=7840+1480-116
=9320-116
=9204
=13x6x2x74-13x5x6x6
=78x2x(74-5x3)
=156x59
=9204
78×148-65×36
=78×(100+50+2)-65×36
=7800+3900-156-65×36
=11544-(50+10+5)×36
=11544-1800-360-180
=9204