Решите уравнения:
1) -(-2,9)+х= -(-31,12)
2) -(23,7)= -(-(+43,5))-у
3) -(-(+4 5/9))= b: (-(-27/83))
4) -(-( + 9 3/4)) : t= -(-(-(- 1/39)))
1) -(-2,9)+х= -(-31,12)
2) -(23,7)= -(-(+43,5))-у
3) -(-(+4 5/9))= b: (-(-27/83))
4) -(-( + 9 3/4)) : t= -(-(-(- 1/39)))
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1) 2,9+x=31,12x=31,12-2,9
х=28,22
2) -23,7=43,5-у
у=43,5+23,7
у=67,2
3) 4 5/9=b:27/83
b= 27/83*41/9
b=123/83=1 40/83
4) 9 3/4:t=1/39
t=39/4:1/39
t=380.25