问题 解答题
5
8
×2
2
3
+2
1
3
÷1
1
3
=
4.85×2+4.85÷
1
97
+4.85=
(1
4
5
+
2
9
×3
3
4
)÷2
19
30
=
5
4
7
×3.5+0.729×
2
9
=
40×39
39
40
=
80×
1
8
÷
1
800
×
1
800
=
答案

5
8
×2
2
3
+2
1
3
÷1
1
3

=

5
3
+
7
4

=

41
12

②4.85×2+4.85÷

1
97
+4.85

=4.85×2+4.85×97+4.85×1,

=4.85×(2+97+1),

=4.85×100,

=485;

③(1

4
5
+
2
9
×3
3
4
)÷2
19
30

=(1

4
5
+
5
6
)÷2
19
30

=

79
30
×
30
79

=1;

④5

4
7
×3.5+0.729×
2
9

=19.5+0.162,

=19.662;

⑤40×39

39
40

=40×(39+

39
40
),

=40×39+40×

39
40

=40×39+39,

=1560+39,

=1599;

⑥80×

1
8
÷
1
800
×
1
800

=80×

1
8
×800×
1
800

=10.

单项选择题
单项选择题 A1/A2型题