题目内容

2.05÷(1.5+0.55)×99%(
3
8
×
2
3
-
1
4
)÷
97
20
87.5%×
8
9
+12.5%×
8
9
14
15
×(
4
21
+
3
14
)÷
2
15
.
(1)2.05÷(1.5+0.55)×99%,
=2.05÷2.05×99%,
=1×99%,
=0.99;

(2)(
3
8
×
2
3
-
1
4
)÷
97
20
,
=(
1
4
-
1
4
)÷
97
20
,
=0÷
97
20
,
=0;

(3)87.5%×
8
9
+12.5%×
8
9
,
=(87.5%+12.5%)×
8
9
,
=1×
8
9
,
=
8
9
;

(4)
14
15
×(
4
21
+
3
14
)÷
2
15
,
=
14
15
×
17
42
÷
2
15
,
=
14
15
×
17
42
×
15
2
,
=
17
6
.
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