решите пж .а) (х + 2,3) • 0,2 = 0,7; в) 4,2х + 8,4 = 14,7;
б) (2,8 - х) : 0,3 = 5; г) 0,39 : х - 0,1 = 0,16.
б) (2,8 - х) : 0,3 = 5; г) 0,39 : х - 0,1 = 0,16.
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0.2x=0.7-0.46
0.2x=0.24
x=0.24:0.2
x=1.2
б)(2.8-x):0.3=5
2.8-x=1.5
x=2.8-1.5
x=1.3
в)4.2x+8.4=14.7
4.2x=14.7-8.4
4.2x=6.3
x=6.3/4.2
x=1.5
г)0.39:x-0.1=0.16
0.39:x=0.16+0.1
0.39:x=0.26
x=0.39:0.26
x=1.5