405-383-(9х+70)=0
22-9/4х-70/4=0
Умножь обе части копнения на 4
88-9х-70=0
18-9х=0
18=9х
Х=2
(5 5/9 - 6.8):(2 13/30 - 2 1/12)*3.6 = -12.8
1) 5 5/9 - 6.8 = 5 5/9 - 6 8/10 = 5 50/90 - 6 72/90 = -1 11/45
2) 2 13/30 - 2 1/12 = 2 26/60 - 2 5/60 = 7/20 = 0.35
3) -1 11/45 : 7/20 = -56/45 * 20/7 = -3 5/9
4) -3 5/9 * 3.6 = -64/5 = -12.8
Б)3ц.13\15
г)5/6
е)2ц.1/3
б)1ц.9/10
г)2/5
10ц.3/4-8ц.1/2=2ц.1/4
е)2ц.1/4
17ц.2/4-2ц.3/4=14ц.3/4 км./ч.