(2.61-4z):0.03+4.6=90
(2.61-4z):0.3=90-4.6
(2.61-4z):0.03=85.4
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
ОТВЕТ:0.012
8.36-5.36:(0.2x+0.47 x)=7.56
8.36-5.36:0.67х=7.56
5.36:0.67х=8.36-7.56
5.36:0.67х= 0.8
0.67х=5.36:0.8
0.67х= 6.7
х= 6.7:0.67
х= 10
ОТВЕТ: 10
(2.61-4z):0.03+4.6=90
(2.61-4z):0.3=90-4.6
(2.61-4z):0.03=85.4
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
ОТВЕТ:0.012
8.36-5.36:(0.2x+0.47 x)=7.56
8.36-5.36:0.67х=7.56
5.36:0.67х=8.36-7.56
5.36:0.67х= 0.8
0.67х=5.36:0.8
0.67х= 6.7
х= 6.7:0.67
х= 10
ОТВЕТ: 10