题目内容
脱式计算.(能简便的要简算)
25×
×
×
(1-
)×
17.6-3.84-6.16
0.8×
+0.8×
+0.8.
25×
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 10 |
(1-
| 2 |
| 3 |
| 1 |
| 4 |
17.6-3.84-6.16
0.8×
| 3 |
| 5 |
| 2 |
| 5 |
考点:分数的四则混合运算,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)运用乘法结合律简算.
(2)先算括号内的,再算括号外的.
(3)运用减法的性质简算.
(4)运用乘法分配律简算.
(2)先算括号内的,再算括号外的.
(3)运用减法的性质简算.
(4)运用乘法分配律简算.
解答:
解:(1)25×
×
×
=(25×
)×(
×
)
=
×
=
(2)(1-
)×
=
×
=
(3)17.6-3.84-6.16
=17.6-(3.84+6.16)
=17.6-10
=7.6
(4)0.8×
+0.8×
+0.8
=0.8×(
+
+1)
=0.8×2
=1.6.
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 10 |
=(25×
| 1 |
| 3 |
| 2 |
| 3 |
| 3 |
| 10 |
=
| 25 |
| 3 |
| 1 |
| 5 |
=
| 5 |
| 3 |
(2)(1-
| 2 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 12 |
(3)17.6-3.84-6.16
=17.6-(3.84+6.16)
=17.6-10
=7.6
(4)0.8×
| 3 |
| 5 |
| 2 |
| 5 |
=0.8×(
| 3 |
| 5 |
| 2 |
| 5 |
=0.8×2
=1.6.
点评:考查了小数、分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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