题目内容
脱式计算.
66.8+750÷50×1.2;
÷(
+
÷
); 1-(
+
÷
).
66.8+750÷50×1.2;
| 7 |
| 9 |
| 2 |
| 5 |
| 3 |
| 20 |
| 3 |
| 10 |
| 4 |
| 9 |
| 5 |
| 18 |
| 4 |
| 5 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算除法,再算乘法,最后算加法;
(2)先算小括号里面的除法,再算加法,最后算括号外面的除法;
(3)先算除法,再算加法,最后算减法.
(2)先算小括号里面的除法,再算加法,最后算括号外面的除法;
(3)先算除法,再算加法,最后算减法.
解答:
解:(1)66.8+750÷50×1.2
=66.8+15×1.2
=66.8+18
=84.8;
(2)
÷(
+
÷
)
=
÷(
+
)
=
÷
=
;
(3)1-(
+
÷
)
=1-(
+
)
=1-
=
.
=66.8+15×1.2
=66.8+18
=84.8;
(2)
| 7 |
| 9 |
| 2 |
| 5 |
| 3 |
| 20 |
| 3 |
| 10 |
=
| 7 |
| 9 |
| 2 |
| 5 |
| 1 |
| 2 |
=
| 7 |
| 9 |
| 9 |
| 10 |
=
| 70 |
| 81 |
(3)1-(
| 4 |
| 9 |
| 5 |
| 18 |
| 4 |
| 5 |
=1-(
| 4 |
| 9 |
| 25 |
| 72 |
=1-
| 19 |
| 24 |
=
| 5 |
| 24 |
点评:考查了分数和小数四则混合运算,注意运算顺序和运算法则,然后再进一步计算.
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