题目内容

1
8
×
3
5
-0.125×0.5
3.2+(9.2-3.8)÷
1
2
17.6-8.2-2.8
1
9
+
1
8
÷
3
4
+
8
9
1
3
+0.2)×
7
8
÷(3-0.5)
97×
95
98
分析:根据四则混算的运算顺序,仔细审题,选择恰当的运用运算定律进行简算.
解答:解:①
1
8
×
3
5
-0.125×0.5,=0.125×0.6-0.125×0.5,
=0.125×(0.6-0.5),
=0.125×0.1,
=0.0125;

②3.2+(9.2-3.8)÷
1
2

=3.2+5.4×2,
=3.2+10.8,
=14;

③17.6-8.2-2.8,
=17.6-(8.2+2.8),
=17.6-11,
=6.6;

1
9
+
1
8
÷
3
4
+
8
9

=
1
9
+
1
8
×
4
3
+
8
9

=(
1
9
+
8
9
)+
1
6

=1+
1
6

=1
1
6


⑤(
1
3
+0.2)×
7
8
÷(3-0.5),
=(
1
3
+
1
5
)×
7
8
÷2.5,
=
8
15
×
7
8
×
2
5

=
14
75


⑥97×
95
98

=(98-1)×
95
98

=98×
95
98
-
95
98

=95-
95
98

=94
3
98
点评:根据运算顺序计算,巧妙运用定律进行简算.
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