作业帮 > 综合 > 作业

选择合适的方法计算下面各题: 19

来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:综合作业 时间:2024/05/16 15:33:29
选择合适的方法计算下面各题:
1
9
选择合适的方法计算下面各题: 19
(1)
1
9×0.25+
8
9÷4-
1
4,
=
1

1
4+
8

1
4-
1
4,
=(
1
9+
8
9-1)×
1
4,
=0×
1
4,
=0;

(2)
11
7×0.375-
4

8
3,
=
11
7×0.375-
4
7×0.375,
=(
11
7-
4
7)×0.375,
=1×0.375,
=0.375;

(3)
7
4-
5

5
4-
1
3,
=
7
4-
2
3-
1
3,
=
7
4-(
2
3+
1
3),
=
7
4-1,
=
3
4;

(4)302×15-6950÷50,
=4530-139,
=4391.