Ответ:
4/m-2/5m при m=1.5, то:
4/1.5-2/7.5=40/15-20/75
40/15-20/75=200/75-20/75=180/75=12/5=2 целых 2/5=2,4
504.
5+х>3x-3(4x+5)
5+x>3x-12x-15
x+9x>-15-5
10x>-20
x>-2
506.
5(x+4)<2(4x-5)
5x+20<8x-10
5x-8x<-10-20
-3x<-30
x>10
508.
x+2<5x-2(x-3)
x+2<5x-2x+6
x-3x<6-2
-2x<4
x>-2
510.
4(x-1)-(9x-5)≥3
4x-4-9x+5≥3
-5x≥3-1
-5x≥2
x≤-0.4
512.
3(x-2)-5(x+3)>27
3x-6-5x-15>27
-2x>27+21
-2x>48
x<-24
18/7 + 204/35 = (90+204)/35 = 294/35 = 8 2/5.
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