3(a+2b)-a=3a+6b-a=2a+6b=2(a+3b),при а+3b=1.1 = 2x1.1 = 2.2
2,4(3x+5y)-4y=7.2x+12y-4y=7.2x+8y= 8(0.9x+y),при 0.9x+y=2 = 8x2=16
8(0.5a+3b)+8a=4a+24b+8a=12a+24b=12(a+2b),при a+2b=2,5 =12x2.5=30
3(0,6m+5n)-3n=1.8m+15n-3n=1.8m+12n=6(0.3m+2n),при 0.3m+2n=4 =6x