题目内容
脱式计算:
×
÷
+
6250÷25+16×12
(
-
)÷
(
+
)×
.
| 5 |
| 3 |
| 1 |
| 4 |
| 5 |
| 2 |
| 17 |
| 4 |
6250÷25+16×12
(
| 5 |
| 14 |
| 1 |
| 7 |
| 2 |
| 3 |
(
| 7 |
| 24 |
| 7 |
| 12 |
| 4 |
| 21 |
分析:(1)把除法改为乘法,先算乘法,再算加法;
(2)先算除法和乘法,再算加法;
(3)(4)先算括号内的,再算括号外的.
(2)先算除法和乘法,再算加法;
(3)(4)先算括号内的,再算括号外的.
解答:解:(1)
×
÷
+
,
=
×
×
+
,
=
+
,
=
;
(2)6250÷25+16×12,
=250+192,
=442;
(3)(
-
)÷
,
=(
-
)×
,
=
×
,
=
;
(4)(
+
)×
,
=
×
,
=
.
| 5 |
| 3 |
| 1 |
| 4 |
| 5 |
| 2 |
| 17 |
| 4 |
=
| 5 |
| 3 |
| 1 |
| 4 |
| 2 |
| 5 |
| 17 |
| 4 |
=
| 1 |
| 6 |
| 17 |
| 4 |
=
| 53 |
| 12 |
(2)6250÷25+16×12,
=250+192,
=442;
(3)(
| 5 |
| 14 |
| 1 |
| 7 |
| 2 |
| 3 |
=(
| 5 |
| 14 |
| 1 |
| 7 |
| 3 |
| 2 |
=
| 3 |
| 14 |
| 3 |
| 2 |
=
| 9 |
| 28 |
(4)(
| 7 |
| 24 |
| 7 |
| 12 |
| 4 |
| 21 |
=
| 21 |
| 24 |
| 4 |
| 21 |
=
| 1 |
| 6 |
点评:在脱式计算中,特别注意运算顺序和运算法则,在计算过程中,能约分的要约分.
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