X+3x+5=17
4x+5=17
4x=17-5
4x=12
x=12:4
x=3
3,5x+2.2x=4,56
5,7x=4.56
x=4.56:5.7
x=<span>0,8
3,2y-2,7y=0,6
0,5y=0,6
y=0.6:0.5
y=</span><span>1,2</span>
|-8,4|+|-3,7|=8.4+3.7=12.1
A) 3/4 > 3/8
B) 3/4 > 1/4
С) 3/4 = 15/20
D) 15/20 > 3/20
1)230:2=115 2)115-70=45( ширина)