1)4575:15=305
2)62x93=5766
3)49184+305=49489
4)49489-33999=15490
(х+2 5/6)/20+7 1/5=7 1/2
(х+2 5/6)/20=7 1/2-7 1/5
(х+2 5/6)/20=7 5/10-7 2/10
(х+2 5/6)/20=3/10
х+2 5/6=3/10×20
х+2 5/6=3×2
х+2 5/6=6
х=6-2 5/6
х=5 6/6-2 5/6
х=3 1/6
49/32=12/d
d=(32×12)/49
d=7.8
(45-5)+(45-30)=55
(72-9)+(72-21)=114
80-50=30
7,3*2,1=15,33
4,8-15,33=-10,53
-10,53-2,7=-13,23
-13,23+3,1=-10,13
-10,13*(-18)=182,34