11/12-2/3=11/12-8/12=3/12=1/4;
3/4+5/12=9/12+5/12=14/12=1 2/12=1 1/6;
2/25+1/20=8/100+5/100=14/100=7/50;
5/21-3/14=10/42-9/42=1/42;
2/15+(1/15+1/3)=2/15+(1/15+5/15)=2/15+6/15=8/15;
1/20+2/15+3/20+1/15=1/20+3/20+2/15+1/15=4/20+3/15=1/5+1/5=2/5;
3/4+2/3-17/12=9/12+8/12-17/12=17/12-17/12=0.
5,2 седьмых
гщалдмсодрлчянш
(156,6:18-8,6)*100:0,1-99=(8,7-8,6)*100:0,1-99=0,1*100:0,1-99=10:0,1-99=
100-99=1
4х² - 22х + 10 = 0
D = b² - 4ac = (-22)² - 4·4·10 = 484 - 160 = 324
22 - √324 22 - 18
х₁ = ----------------- = ------------ = 4/8 = 1/2 = 0,5
2 * 4 8
22 + √324 22 + 18
х₂ = ------------------- = -------------- = 40/8 = 5
2 * 4 8