题目内容
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×(
+
-
)
(1)9003-554÷18×27
(2)
| 1 |
| 12 |
| 5 |
| 12 |
| 1 |
| 2 |
| 11 |
| 24 |
(3)1110÷[56×(
| 3 |
| 7 |
| 3 |
| 8 |
(4)4.3-(0.6+2.4÷12)
(5)99×
| 4 |
| 25 |
(6)48×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 12 |
分析:(1)先算除法,再算乘法,最后算减法;
(2)先算小括号里面的加法,再算除法,最后算括号外面的加法;
(3)中括号里面的根据乘法分配律进行计算,最后算除法;
(4)先算除法,再算加法,最后算减法;
(5)根据乘法分配律进行计算;
(6)根据乘法分配律进行计算.
(2)先算小括号里面的加法,再算除法,最后算括号外面的加法;
(3)中括号里面的根据乘法分配律进行计算,最后算除法;
(4)先算除法,再算加法,最后算减法;
(5)根据乘法分配律进行计算;
(6)根据乘法分配律进行计算.
解答:解:
(1)9003-554÷18×27,
=9003-
×27,
=9003-831,
=8172;
(2)
+(
+
)÷
,
=
+
÷
,
=
+2,
=2
;
(3)1110÷[56×(
-
)],
=1110÷[56×
-56×
],
=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×
,
=(100-1)×
,
=100×
-1×
,
=16-
,
=15
;
(6)48×(
+
-
),
=48×
+48×
-48×
,
=12+8-4,
=20-4,
=16.
(1)9003-554÷18×27,
=9003-
| 277 |
| 9 |
=9003-831,
=8172;
(2)
| 1 |
| 12 |
| 5 |
| 12 |
| 1 |
| 2 |
| 11 |
| 24 |
=
| 1 |
| 12 |
| 11 |
| 12 |
| 11 |
| 24 |
=
| 1 |
| 12 |
=2
| 1 |
| 12 |
(3)1110÷[56×(
| 3 |
| 7 |
| 3 |
| 8 |
=1110÷[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×
| 4 |
| 25 |
| 4 |
| 25 |
=16-
| 4 |
| 25 |
=15
| 21 |
| 25 |
(6)48×(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 12 |
=48×
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 12 |
=12+8-4,
=20-4,
=16.
点评:此题主要考查整数、分数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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