问题
解答题
计算下面各题,能简算的要用简便方法算.
|
答案
(1)201-5406÷51,
=201-106,
=95;
(2)1.8×(21÷1.4),
=1.8×15,
=27;
(3)3-4×2.33×0.25,
=3-(4×0.25)×2.33,
=3-1×2.33,
=3-2.33,
=0.67;
(4)(
-7 8
)×(5 16
+5 9
),2 3
=
×9 16
,11 9
=
;11 16
(5)
÷[7 4
-(0.15+5 6
)],9 20
=
÷[7 4
-0.6],5 6
=
÷7 4
,7 30
=7.5.