(3 3/5 - 2 1/15)*5 = (54/15 - 31/15)*5 = 23/15 * 5 = 23/3 = 7 2/3.
<span>57/3=19
75/25=5 неверно </span>75/25=3<span>
80/20=40 </span>неверно 80/20=4<span>
72/12=6 </span><span>
88/8=10 </span>неверно 88/8=11<span>
98/7=17 </span>неверно 98/7=14<span>
44/22=2
99/9=11
96/12=3 </span>неверно 96/12=8
2+(в-4)=2+в-4=-2+в
-(3-у)+7=-3+у+7=4+у
(3+у)-42=3+у-42=-39+у
X^2=0,3*1,2
x^2=0,36
x=корень из 0,36
x= +0.6 и -0,6