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Вот я написала.нужно делать так
-0,28х+2,7х-3,401=2,42х-3,401
-7,2х-3,4х+9,6х= - х
<span>1) 2,5,10,13,26,65,130; 2)3,7,9,21,27,63.</span>
<span>(( 32 * 125 + 256 * 55 ) /1130*1250 - ( 45* 76 + 98 *25 )) /1570 =
=</span><span>(( 32 * 5*25 + 32*8 *5*11) /113*125 - ( 9*5* 2*38 + 2*49 *5*5)) /1570 =
</span>=(( 160*25 + 160*88) /113*125 - ( 9*10*38 + 10*49*5)) /1570 =
=(160(25 + 88) /113*125 - 10( 9*38 + 49*5)) /1570 =
=10(16*113 /113*125 - (342+245)) /1570 =(16*125 - 587) /157 =
=(2000-587)/157=1413/157=9