选择合适的方法,计算下面各题.
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/09/22 20:35:08
选择合适的方法,计算下面各题.
18.7-4.375-6.625
920÷40+23×50.
99.99×22.22+33.33×33.34
18.7-4.375-6.625
920÷40+23×50.
99.99×22.22+33.33×33.34
4 |
15 |
①18.7-4.375-6.625
=18.74-(4.375+6.625)
=18.74-11
=7.74
②920÷40+23×50
=23+1150
=1173
③99.99×22.22+33.33×33.34
=33.33×(3×22.22)+33.33×33.34
=33.33×66.66+33.33×33.34
=33.33×(66.66+33.34)
=33.33×100
=3333
④
4
15÷[(
5
7-
3
14)÷
3
4]
=
4
15÷[
1
2×
4
3]
=
4
15×
3
2
=
2
5
=18.74-(4.375+6.625)
=18.74-11
=7.74
②920÷40+23×50
=23+1150
=1173
③99.99×22.22+33.33×33.34
=33.33×(3×22.22)+33.33×33.34
=33.33×66.66+33.33×33.34
=33.33×(66.66+33.34)
=33.33×100
=3333
④
4
15÷[(
5
7-
3
14)÷
3
4]
=
4
15÷[
1
2×
4
3]
=
4
15×
3
2
=
2
5