1) 6ху
2) -4х+8
3) 6х-2
4) -12аb
5) 16х-24
6) -12+3х
6/57 : 8= 6/57* 1/8=6/456=1/76
3/20 : 5=3/20* 1/5=3/100
21/26 : 7 =21/26* 1/7=3/26*1/1=3/26
3/5 : 10 =3/5* 1/10=3/50
7/8 : y=2
у=7/8:2
у=7/8* 1/2
у=7/16
4x= 16/25
х=16/25:4
х=16/25* 1/4
х=4/25*1/1
х=4/25
n:5/9=4
n=4*5/9
n=20/9
b:2=3/4
b=3/4*2
b=6/4
b=3/2=1 1/2
2/3*x=2/3*1=2/3
2/3*2=4/3
2/3*3=6/3=2
2/3*18=36/3=12
S=πr^2
1.3.14*6^2=113.1 см2
2.3,14*8^2=201,06 см2
3.R=√S/π=√78.5*3.14=15.7 см
13\17+х-2\17 = 14\17
х = 14\17-13\17+2\17
х = 3\17