(17-22)(17+22)/(49-10)(49+10)= -5*39/39*59= -5/59
(100-60)(100+60)/(70-90)(70+90)= 40*160/-20*160= -2
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(17-22)(17+22)/(49-10)(49+10)= -5*39/39*59= -5/59
(100-60)(100+60)/(70-90)(70+90)= 40*160/-20*160= -2