问题 解答题
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
答案

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

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