问题
解答题
脱式计算,能简算的要简算. (1)9003-554÷18×27 (2)
(3)1110÷[56×(
(4)4.3-(0.6+2.4÷12) (5)99×
(6)48×(
|
答案
(1)9003-554÷18×27,
=9003-
×27,277 9
=9003-831,
=8172;
(2)
+(1 12
+5 12
)÷1 2
,11 24
=
+1 12
÷11 12
,11 24
=
+2,1 12
=2
;1 12
(3)1110÷[56×(
-3 7
)],3 8
=1110÷[56×
-56×3 7
],3 8
=1110÷[24-21],
=1110÷3,
=370;
(4)4.3-(0.6+2.4÷12),
=4.3-(0.6+0.2),
=4.3-0.8,
=3.5;
(5)99×
,4 25
=(100-1)×
,4 25
=100×
-1×4 25
,4 25
=16-
,4 25
=15
;21 25
(6)48×(
+1 4
-1 6
),1 12
=48×
+48×1 4
-48×1 6
,1 12
=12+8-4,
=20-4,
=16.