dmitrij330

Verified answer

1) 8  2/7 - 5а > 0
-5a>-8  2/7
a<-8  2/7 : (-5)
a<58/35
а<1  23/35   при а < 1  23/25
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2) 9.3 + 4a>0
4a>-9.3
a>-9.3 / 4
a> -2.325   при a> -2.325
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3) 11  3/11  - 31a >0
-31a>-11 3/11
a< -11 3/11 : (-31)
a<124/341   
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4)11,11 + 11a > 0
11a>-11,11
a> -11,11 /11
a> -1,01
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5) 7  2/15 + 2/3 a >0
2/3a> -7  2/15
a> -107/15 : 2/3
a> -107/10
a> -10.7
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6) 50.5-0.5a>0
-0.5a>-50.5
a<-50.5 : (-0.5)
a<101