<span>c + d - с² + d²=</span>c + d <span><span>+( d²</span>- c²) =(c+d)+(d+c)(d-c)=(c+d)(1+d-c)
</span>
Х+5+(4х-6)=х+5+4х-6=5х-1
(3х-2)-(5х-8)=3х-2-5х+8=6-2х=2(3-х)
20+5(0,2у-4)=20+у-20=у
4×2-11х-3=0
8-11х-3=0
11х=8+3
х=11:11
х=1
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
(5х+х):2=18;
6х:2=18;
6х=2×18;
6х=36;
х=6
6-первое число
6×5=30
30-второе число