题目内容
脱式计算
÷[1-(
+
)]
306×15-2080.
5 |
6 |
3 |
4 |
1 |
12 |
306×15-2080.
分析:(1)先算小括号内的,再算中括号内的,最后算括号外的;
(2)先算乘法,再算减法.
(2)先算乘法,再算减法.
解答:解:(1)
÷[1-(
+
)],
=
÷[1-
],
=
÷
,
=
×6,
=5;
(2)306×15-2080,
=4590-2080,
=2510.
5 |
6 |
3 |
4 |
1 |
12 |
=
5 |
6 |
5 |
6 |
=
5 |
6 |
1 |
6 |
=
5 |
6 |
=5;
(2)306×15-2080,
=4590-2080,
=2510.
点评:此题主要考查分数、整数的四则混合运算的运算顺序.
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