9000÷25 简便运算

问题描述:

9000÷25 简便运算
(4/5-1/16*4/5)/(1/6+1/12) 500-(720+650/130)*6.4

9000÷25=90×100÷25=90×4=360
.
(4/5-1/16*4/5)/(1/6+1/12)
=【(4/5)×(1- 1/16)】÷(3/12)
=[(4/5)×(15/16)]÷(1/4)
=(3/4)×4
=3
.
500-(720+650/130)*6.4
=500- (720+5)*6.4
=500 - 725*6.4
=500 - 700*6.4 - 25*4*1.6
=500 - 4480 - 160
=500 - 4640
=-4140