题目内容

用递等式计算(能简算的要简算)
①(
1
4
+
1
2
)÷(1-
3
8
×
3
4

②3.2×1.25+4.8×1
1
4

③[(5
2
3
-4
3
4
)÷1
5
6
]×25%
15
16
+(
7
16
-
1
4
)÷
1
2
①(
1
4
+
1
2
)÷(1-
3
8
×
3
4
);
=
3
4
÷(1-
9
32
),
=
3
4
×
32
23

=1
1
23

②3.2×1.25+4.8×1
1
4

=3.2×1.25+4.8×1.25,
=1.25×(3.2+4.8),
=1.25×8,
=10;
③[(5
2
3
-4
3
4
)÷1
5
6
]×25%,
=[
11
12
÷
11
6
1
4

=[
11
12
×
6
11
1
4

=
1
2
×
1
4

=
1
8

15
16
+(
7
16
-
1
4
)÷
1
2

=
15
16
+
3
16
÷
1
2

=
15
16
+
3
16
×2,
=
15
16
+
3
8

=1
5
16
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