А.х+2х=21,42С.2х+5х=42,7Н.12х-3х=41,7Х.7х-4х=0,96

Question

А.х+2х=21,42
С.2х+5х=42,7
Н.12х-3х=41,7
Х.7х-4х=0,96

Answer 1

A.3x=21,42
x=7,14
C.7x=42,7
x=6,1
H.9x=41,7
x=139/30
X.3x=0.96
x=0.32

Answer 2

А.х+2х=21,42 
3х=21,42
х=21,42:3
х=7,14

С.2х+5х=42,7
7х=42,7
х=42,7:7
х=6,1

Н.12х-3х=41,7
9х=41,7
х=4 57/90

Х.7х-4х=0,96
3х=0,96
х=0,96:3
х=0,32