(1)28
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/14 05:34:48
(1)
2 |
8 |
(1)
2
8=
9
x,
2x=8×9,
2x÷2=72÷2,
x=36;
(2)
1
2:
1
5=
1
4:x,
1
2x=
1
5×
1
4,
1
2x÷
1
2=
1
20÷
1
2,
x=
1
10;
(3)
1.25
0.25=
x
1.6,
0.25x=1.25×1.6,
0.25x÷0.25=2÷0.25,
x=8;
(4)40:x=2.5:15,
2.5x=40×15,
2.5x÷2.5=600÷2.5,
x=240;
(5)
1
2:x=5:16,
5x=
1
2×16,
5x÷5=8÷5,
x=1.6;
(6)
3
4:
1
5=20:x,
3
4x=
1
5×20,
3
4x÷
3
4=4÷
3
4,
x=5
1
3.
2
8=
9
x,
2x=8×9,
2x÷2=72÷2,
x=36;
(2)
1
2:
1
5=
1
4:x,
1
2x=
1
5×
1
4,
1
2x÷
1
2=
1
20÷
1
2,
x=
1
10;
(3)
1.25
0.25=
x
1.6,
0.25x=1.25×1.6,
0.25x÷0.25=2÷0.25,
x=8;
(4)40:x=2.5:15,
2.5x=40×15,
2.5x÷2.5=600÷2.5,
x=240;
(5)
1
2:x=5:16,
5x=
1
2×16,
5x÷5=8÷5,
x=1.6;
(6)
3
4:
1
5=20:x,
3
4x=
1
5×20,
3
4x÷
3
4=4÷
3
4,
x=5
1
3.