Question

Am nevoie de ajutor la matematica este editura paralela 45

Answer 1

a)7(x-1/5)=7/4
x-1/5=7/4:4
x-1/5=7/16
x=7/16+1/5
x=51/80

b)15/10(x+2/9)=225/100
x+2/9=225/100:15/10
x+2/9=15/10
x=15/10-2/9
x=115/90=23/18

c)14/9(x-1)=7/4
x-1=7/4:14/9
x-1=9/8
x=9/8+1
x=17/8

d)3/4(x+1/7)=15
x+1/7=15:3/4
x+1/7=20
x=20-1/7
x=139/7

e)6/5(x-5/10)=12
x-5/10=12:6/5
x-5/10=10
x=105/10

f)3/7(x-1/2)=15/14
x-1/2=15/14;3/7
x-1/2=35/14
x=34/14+1/2
x=3

10)7·x-8=13
7·x=21
x=3

b)3/4-5/6·x=1/4
5/6·x=3/4-1/4
5/6·x=1/2
x=3/5

c)2/5·x-1/2=1/20
2/5·x=1/20+1/2
2/5·x=11/20
x=11/8