(<span>2,61-4z):0,03+4,6=90
(</span><span>2,61-4z):0,03=90-4,6
</span><span>(2,61-4z):0,03=85,4
(</span><span>2,61-4z)=85,4*0,03
2,61-4z=2.562
-4z=2.562-2.61
-4z=-0.048
z=-0.048/(-4)
z=0.012</span>
А)х/10=2/23
х=20/23
б)х/13=5/67
х=65/67
в)х/23=22/85
х=506/85
1)300618-210438=90180
2)11388-6576-384=4428
3)90180:9=10020
4)4428*14=61992
5)61992+1296=63288
6)63288+10020=73308