Решите систему неравенств: 1) {0,25х-1<0, 0,7х>1,4; 2){1,2х+3,6≥0, 0,8х-4≤0; 3){13х-1>7х+1, 1-х<4-3х; {4х-21≤3+х, 5х-8>1+2х.
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