怎样算简便就怎样算. ①3/7−(1/2−3/7) +1/2 ②73÷0.8÷12.5 ③1/2×201−1/2 ④(1/3+1/8−1/24)÷ 1/24.

问题描述:

怎样算简便就怎样算.
3
7
−(
1
2
3
7
) +
1
2
②73÷0.8÷12.5
1
2
×201−
1
2
(
1
3
+
1
8
1
24
)÷ 
1
24

3
7
−(
1
2
3
7
) +
1
2

=
3
7
-
1
2
+
3
7
+
1
2

=(
3
7
+
3
7
)+(
1
2
1
2
),
=
6
7
+0,
=
6
7

②73÷0.8÷12.5,
=73÷(0.8×12.5),
=73÷10,
=7.3;
1
2
×201−
1
2

=(201-1)×
1
2

=200×
1
2

=100;
(
1
3
+
1
8
1
24
)÷ 
1
24

=(
1
3
+
1
8
-
1
24
)×24,
=
1
3
×24+
1
8
×24-
1
24
×
24,
=8+3-1,
=10.