题目内容
脱式计算.(能简算的要简算.)
19÷(
+
); (
+
-
)×24; 0.6×
+
×
+60%×
; 44
÷11.
19÷(
| 3 |
| 4 |
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 6 |
| 18 |
| 25 |
| 3 |
| 5 |
| 6 |
| 25 |
| 1 |
| 25 |
| 11 |
| 14 |
考点:整数、分数、小数、百分数四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)先算括号内的,再算括号外的;
(2)(3)运用乘法分配律简算;
(4)把带分数拆为两部分,运用除法的性质简算.
(2)(3)运用乘法分配律简算;
(4)把带分数拆为两部分,运用除法的性质简算.
解答:
解:(1)19÷(
+
)
=19÷
=19×
=12
(2)(
+
-
)×24
=
×24+
×24-
×24
=8+3-4
=7
(3)0.6×
+
×
+60%×
=0.6×
+0.6×
+0.6×
=0.6×(
+
+
)
=0.6×1
=0.6
(4)44
÷11
=(44+
)÷11
=44÷11+
÷11
=4+
=4
| 3 |
| 4 |
| 5 |
| 6 |
=19÷
| 19 |
| 12 |
=19×
| 12 |
| 19 |
=12
(2)(
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 6 |
=
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 6 |
=8+3-4
=7
(3)0.6×
| 18 |
| 25 |
| 3 |
| 5 |
| 6 |
| 25 |
| 1 |
| 25 |
=0.6×
| 18 |
| 25 |
| 6 |
| 25 |
| 1 |
| 25 |
=0.6×(
| 18 |
| 25 |
| 6 |
| 25 |
| 1 |
| 25 |
=0.6×1
=0.6
(4)44
| 11 |
| 14 |
=(44+
| 11 |
| 14 |
=44÷11+
| 11 |
| 14 |
=4+
| 1 |
| 14 |
=4
| 1 |
| 14 |
点评:仔细观察数据,根据数据特点,灵活简算.
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