|-0,85|=|-3,4|*|х|
0,85=3,4*|х|
|х|=0.85/3.4
|х|=0.25
х1=0,25
х2=-0,25
Z:17=34
z=34:17
z=2
81:x=9
81:9=x
9=x
А)5/3×1/2÷4/5
5/6÷4/5
5/6×5/4
25/24=1 1/24
б)4/3÷1/6-5 3/7
4/3×6/1-15/7
8-15/7
56-15/7
41/7
5 6/7
8\15( 15\4-5\16н)-3\20(20\3м-40\9н)= 8\15*15\4-8\15*5\16н-3\20*20\3м+3\20*40\9н=2-1\6н-м+2\3н=1\2н+2-м