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Yana123y
@Yana123y
October 2021
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coolpandaRF
В) 3/7a+2/5=1
3/7a=1-2/5
3/7a=3/5
a=3/5:3/7
a=21/35:15/35
a=21/35×35/15
a=7/5
a=1 2/5
Ответ: a=1 2/5
e) 2/7x+3/7x=2 7/14
5/7x=2 7/14
x=2 7/14:5/7
x=35/14:5/7
x=35/14:10/14
x=15/14×14/10
x=3/2
x=1 1/2
Ответ: x=1 1/2
и) 2/5z+2/3z-7/15z=2 1/2
5/15z+10/15z-7/15z=2 1/2
8/15z=2 1/2
z=2 1/2:8/15
z=5/2:8/15
z=75/30:16/30
z=75/30×30/16
z=75/16
z=4 11/16
Ответ: z=4 11/16
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Answers & Comments
3/7a=1-2/5
3/7a=3/5
a=3/5:3/7
a=21/35:15/35
a=21/35×35/15
a=7/5
a=1 2/5
Ответ: a=1 2/5
e) 2/7x+3/7x=2 7/14
5/7x=2 7/14
x=2 7/14:5/7
x=35/14:5/7
x=35/14:10/14
x=15/14×14/10
x=3/2
x=1 1/2
Ответ: x=1 1/2
и) 2/5z+2/3z-7/15z=2 1/2
5/15z+10/15z-7/15z=2 1/2
8/15z=2 1/2
z=2 1/2:8/15
z=5/2:8/15
z=75/30:16/30
z=75/30×30/16
z=75/16
z=4 11/16
Ответ: z=4 11/16