题目内容
简便计算
÷7+
×
×98+16%×3-0.16
45×
.
| 7 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
| 4 |
| 25 |
45×
| 3 |
| 44 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)把除法变为乘法,运用乘法分配律简算;
(2)把分数和百分数化为小数,运用乘法分配律简算;
(3)把45看作44+1,运用乘法分配律简算.
(2)把分数和百分数化为小数,运用乘法分配律简算;
(3)把45看作44+1,运用乘法分配律简算.
解答:
解:(1)
÷7+
×
=
×
+
×
=(
+
)×
=1×
=
;
(2)
×98+16%×3-0.16
=0.16×98+0.16×3-0.16
=0.16×(98+3-1)
=0.16×100
=16;
(3)45×
=(44+1)×
=44×
+
=3+
=3
.
| 7 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 7 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 7 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(2)
| 4 |
| 25 |
=0.16×98+0.16×3-0.16
=0.16×(98+3-1)
=0.16×100
=16;
(3)45×
| 3 |
| 44 |
=(44+1)×
| 3 |
| 44 |
=44×
| 3 |
| 44 |
| 3 |
| 44 |
=3+
| 3 |
| 44 |
=3
| 3 |
| 44 |
点评:注意观察题目中数字构成的特点和规律,善于灵活运用运算定律,巧妙解答.
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