Решите уравнения:
1)90-50- x = 31×100
2)70×60+ x = 83×100
3) y-80×4=13×10
4) y +71×10=50×60
1)90-50- x = 31×100
2)70×60+ x = 83×100
3) y-80×4=13×10
4) y +71×10=50×60
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Ответ:
1)90-50+x=31×100
40+х=3100
х=3100-40
х=3060
----------------------------
90-50+3060=31×100
3100=3100
2)70×60+х=83×100
4200+х=8300
х=8300-4200
х=4100
-----------------------------
70×60+4100=83×100
8300=8300
3)у-80×4=13×10
у-320=130
у=320+130
у=450
------------------------
450-80×4=13×10
130=130
4)у+71×10=50×60
у+710=3000
у=3000-710
у=2290
---------------------------
2290+71×10=50×60
3000=3000