a,(1/2+1,5).x=1/5

2.x=1/5

x= 1/5.2

x=1/10

b,(-1/3/5+x):12/13=2/1/6

-1/3/5+x=13/6.12/13

x=2+1/2/5

x=18/5

c,(x:2/1/3).1/7=-3/8

x.3/7.1/7=-3/8

x=-3/8:3/49

x=-49/8

d,-4/7.x+7/5=1/8:(-1/2/3)

-4/7x+7/5=1/8.-3/5

-4/7x=-3/40-7/5

x=-59/40:-4/7

x=413/160

a, x+1/3=1/2-56

x+1/3=-1/3

x=-1/3-1/3

x=-2/3

b,3/8+5/8-1/5-x=1/5

1-1/5-x=1/5

x= 1-1/5-1/5

x=3/5

a,x=7-2/5+1,62=8,22

b,x= 4/3/5+1/5-1/2=43/10

c, 2x-x=3/5+4/7

x=41/35

d, x= 3/1/2-5/7+1/13-0,25

=2/223/364

a,A=[2/7(1/4-1/3)]:[2/7(1/3-2/5)]

=(1/4-1/3):(1/3-2/5)

=6/4

b, B= .3/4(1/5-2/7-1/3+2/7)/1/5(2/7+1/3)-1/3(2/7+1/3)

=3/4(1/5-1/3)/(1/5-1/3)(2/7+1/3)

=63/52

a) A = 3/5 . 6/7 + 3/7 : 5/3 - 2/7 : 1/ 2/3

=3/5.(6/7+3/7-2/7)=3/5

b,B=(-13.2/5+-2/9.2/5+2/5.11/9).5/2

=(-13.2/5+11/9).2/5.5/2

=-13+(11/9-2/9)

=-12

c,C=(-4/5+5/7).3/2+(-1/5+2/7).3/2

=(-4/5+5/7+-1/5+2/7).3/2

=(-4/5+-1/5)+(5/7+2/7).3/2=0

a,P=2/3+1/4+3/5-7/45+5/9+1/12+1/35

=(2/3+1/4+1/12)+(5/9-7/45)+3/5+1/35

=1+4/5+3/5+1/45= 71/35

b,Q=(5-6-2)+(-3/4-7/4+5/4)+(1/5+8/5-16/5)=-(3+5/4+7/5)=-113/20

a,A= (1/3+2/3)-(8/15+7/15)+(-1/7+1/1/7)

=1-1+1=1

b,B =(0,25+3/5-(1/8-2/5+1/1/4)

=(1/4-1-1/4)+1-1/8

=-1/8