问题
解答题
脱式计题,能简算的要简算.
|
答案
(1)(81+
)÷918 13
=(81+
)×18 13
,1 9
=81×
+1 9
×18 13
,1 9
=9+
,2 13
=9
;2 13
(2)375+450÷18×25
=375+25×25,
=375+625,
=1000;
(3)51×101
=51×(100+1),
=51×100+51,
=5100+51,
=5151;
(4)12.5×32×0.25
=(12.5×8)×(4×0.25),
=100×1,
=100.