题目内容
计算下面各题(能简算的要简算)
4050+6300÷42
5.04×6.5-2.76
÷[1-(
+
)]
×
+
÷125%
4050+6300÷42
5.04×6.5-2.76
| 2 |
| 15 |
| 1 |
| 5 |
| 1 |
| 3 |
| 27 |
| 43 |
| 4 |
| 5 |
| 16 |
| 43 |
分析:(1)先算除法,再算加法;
(2)先算乘法,再算减法;
(3)先算小括号里面的加法,再算中括号里面的减法,最后算除法;
(4)把除法改为乘法,进一步利用乘法分配律简算.
(2)先算乘法,再算减法;
(3)先算小括号里面的加法,再算中括号里面的减法,最后算除法;
(4)把除法改为乘法,进一步利用乘法分配律简算.
解答:解:(1)4050+6300÷42
=4050+150
=4200;
(2)5.04×6.5-2.76
=32.76-2.76
=30;
(3)
÷[1-(
+
)]
=
÷[1-
]
=
÷
=
;
(4)
×
+
÷125%
=
×
+
×
=(
+
)×
=
.
=4050+150
=4200;
(2)5.04×6.5-2.76
=32.76-2.76
=30;
(3)
| 2 |
| 15 |
| 1 |
| 5 |
| 1 |
| 3 |
=
| 2 |
| 15 |
| 8 |
| 15 |
=
| 2 |
| 15 |
| 7 |
| 15 |
=
| 2 |
| 7 |
(4)
| 27 |
| 43 |
| 4 |
| 5 |
| 16 |
| 43 |
=
| 27 |
| 43 |
| 4 |
| 5 |
| 16 |
| 43 |
| 4 |
| 5 |
=(
| 27 |
| 43 |
| 16 |
| 43 |
| 4 |
| 5 |
=
| 4 |
| 5 |
点评:计算注意运算顺序,抓住数字特点,选用合理的方法解答即可.
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