问题 解答题
脱式计题,能简算的要简算.
(81+
18
13
)÷9
375+450÷18×2551×10112.5×32×0.25.
答案

(1)(81+

18
13
)÷9

=(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.

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