题目内容
请细心计算
(1)3720-4028÷38×6
(2)90.72÷7.2-5.3×2.04
(3)19÷[(
+
)÷
]
(4)4.5÷[(
-3÷7.5)×3
].
(1)3720-4028÷38×6
(2)90.72÷7.2-5.3×2.04
(3)19÷[(
3 |
4 |
1 |
5 |
1 |
2 |
(4)4.5÷[(
1 |
2 |
3 |
5 |
分析:根据整数、分数 和小数的四则混合运算进行计算即可得到答案.
解答:解:(1)3720-4028÷38×6
=3720-106×6
=3720-636
=3084;
(2)90.72÷7.2-5.3×2.04
=12.6-10.812
=1.788;
(3)19÷[(
+
)÷
]
=19÷{
÷
}
=19÷1.9
=10;
(4)4.5÷[(
-3÷7.5)×3
]
=4.5÷[(
-0.4)×3
]
=4.5÷[0.1×3.6]
=4.5÷0.36
=12.5.
=3720-106×6
=3720-636
=3084;
(2)90.72÷7.2-5.3×2.04
=12.6-10.812
=1.788;
(3)19÷[(
3 |
4 |
1 |
5 |
1 |
2 |
=19÷{
19 |
20 |
1 |
2 |
=19÷1.9
=10;
(4)4.5÷[(
1 |
2 |
3 |
5 |
=4.5÷[(
1 |
2 |
3 |
5 |
=4.5÷[0.1×3.6]
=4.5÷0.36
=12.5.
点评:此题主要考查的是整数、分数和小数的四则混合运算.
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