(2.61-4z): 0,03+4,6=90 и 8,36- 5,36 : (0.2 к + 0,47 к ) = 7,56 решить уравнения

(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