<span>17−8.15/31+x+3.29/31=<span>16.14/31
</span></span><span><span>−8.15+17/x+31</span>+3.29/31=<span>16.14/31
</span></span><span><span>8.85/x+31</span>+3.29/31=<span>16.14/31
</span></span><span><span>8.85/x+31</span>+3.29/31=<span>16.14/31
</span></span><span><span>8.85/<span>x+31</span></span>+<span>329/3100</span>=<span>16.14/31
</span></span><span>x=−<span>2480/257</span></span>
-4(b-9)+7(3b+5) = -4b +36 +21b+35 = 17b + 71
А) 4/16=0.25
б) 13/16+7/24=1 5/48
в) 19/20 -5/12+2/5=14/15