用你喜欢的方法计算下面各题. 18×58+42÷8    425×99+425       48×(12+13+14)

2024-11-25 09:14:03
推荐回答(1个)
回答1:

(1)

1
8
×58+42÷8,
=
1
8
×58+42×
1
8

=(58+42)×
1
8

=100×
1
8

=12.5;

(2)
4
25
×99+
4
25

=
4
25
×99+
4
25
×1,
=
4
25
×(99+1),
=
4
25
×100,
=16;

(3)48×(
1
2
+
1
3
+
1
4
),
=48×
1
2
+48×
1
3
+48×
1
4

=24+16+12,
=52;

(4)
3
8
+
15
4
×0.35+0.65÷
4
15

=
3
8
+
15
4
×0.35+0.65×
15
4

=
3
8
+(0.35+0.65)×
15
4

=
3
8
+1×
15
4

=
3
8
+
15
4

=
33