а) х:7/15= 15/28
х×7/15= 15/28
15/7х= 15/28
х= 1/4.
б) 5 1/4:х= 7/8
21/4×1/х= 7/8
21/4х= 7/8
28х=168
х= 6.
в) у-7/12у = 4 1/6
у- 7/12у = 25/6
12у-7у= 50
5у=50
у= 10.
г) (3.1х+х):0.8= 2.05
4.1х:4/5= 2.05
41/2х×1/4= 2.05
х= 8/41×41/20
х= 2×1/5
х= 2/5.
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Answers & Comments
а) х:7/15= 15/28
х×7/15= 15/28
15/7х= 15/28
х= 1/4.
б) 5 1/4:х= 7/8
21/4×1/х= 7/8
21/4х= 7/8
28х=168
х= 6.
в) у-7/12у = 4 1/6
у- 7/12у = 25/6
12у-7у= 50
5у=50
у= 10.
г) (3.1х+х):0.8= 2.05
4.1х:4/5= 2.05
41/2х×1/4= 2.05
х= 8/41×41/20
х= 2×1/5
х= 2/5.