题目内容

直接写出结果
0.125+
7
8
=
1
1

(
1
8
+
2
9
)×72
=
25
25

7.95-0.73-0.27=
6.95
6.95

32+23=
17
17

7.3÷10%
=73
=73

14×
5
7
÷14×
5
7
=
25
49
25
49
分析:0.125+
7
8
先把小数化成分数再计算;
(
1
8
+
2
9
)×72
运用乘法分配律简算;
7.95-0.73-0.27根据连续减去两个数等于减去这两个数的和简算;
32+23=3×3+2×2×2计算;
7.3÷10%先把百分数化成分数再计算;
14×
5
7
÷14×
5
7
=先把除法变成乘法,再运用乘法结合律简算.
解答:解:(1)0.125+
7
8

=
1
8
+
7
8

=1;

(2)(
1
8
+
2
9
)×72

=
1
8
×72+
2
9
×72,
=9+16,
=25;

(3)7.95-0.73-0.27,
=7.95-(0.73+0.27),
=7.95-1,
=6.95;

(4)32+23
=(3×3)+(2×2×2),
=9+8,
=17;

(5)7.3÷10%,
=7.3×10,
=73;

(6)14×
5
7
÷14×
5
7

=14×
5
7
×
1
14
×
5
7

=(14×
1
14
)×(
5
7
×
5
7
),
=1×
25
49

=
25
49
点评:本题考查了基本的运算,要注意分析数据,选择合适的简算方法计算.
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