1) 3(a+2b)-a при а+3b=1,1; 2) 2,4(3x+5y)-4y при 0,9x+y=2; 3)8(0,5a+3b)+8a при а+2b=2,5; 4) 3(0,6m+5n)-3n при 0,3m+2n=4 ?
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