Y=3-2-1•0+9-3-2-3+9+8-7-5=7
0,5(4+x)-0,4(x-3)=2,5
2+0,5x-0,4x+1,2=2,5
0,5x-0,4x=2,5-2-1,2
0,1x=-0,7
x=-0,7:0,1
x=-7
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Если х= -3 то у =9
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<span>64 + 16 = 60 + 10 + 4 + 6 = 70 + 10 = 80
70 - 24 = 70 - 20 - 4 = 50 - 4 = 46
90 - 23 = 90 - 20 - 3 = 70 - 3 = 67
35 + 35 = 30 + 30 + 5 + 5 = 60 + 10 = 70
37 + 43 = 30 + 40 + 7 + 3 = 70 + 10 = 80
90 - 68 = 90 - 60 - 8 = 30 - 8 = 22</span>