用简便方法计算(写出简算过程)①(13+14+16)×12 ...

2025-03-18 16:13:58
推荐回答(1个)
回答1:

①(
1
3
+
1
4
+
1
6
)×12,
=
1
3
×12+
1
4
×12+
1
6
×12,
=4+3+2,
=9;

②18.93-6
5
8
-3
3
8

=18.93-(6
5
8
+3
3
8
),
=18.93-10,
=8.93;

③163×
3
4
-0.75×62-75%,
=163×0.75-0.75×62-0.75,
=(163-62-1)×0.75,
=100×0.75,
=75;

④7
5
12
÷
3
5
+1
2
3
×2
7
12

=7
5
12
×
5
3
+
5
3
×2
7
12

=(7
5
12
+2
7
12
)×
5
3

=10×
5
3

=
50
3