Question

2x +13,25=17,36

6(x+1,2)-3,6=7,8

suma a doua nr este 111,42.sa se afle nr. stiind ca unul dintre ele este de doua ori mai mic ca celalalt.

calculati media aritmetica a nr

a)24 si 16
b)1,2;7,8 si 2,4
c)1 supra 2;2 supra 3;2,75 si 0,1(6)

Answer 1

2x+13.25= 17.36
2x= 17.36- 13.25
2x= 4.11
x= 4.11:2
x= 2.055

6(x+1.2) -3.6= 7.8
6x+ 7.2= 7.8+3.6
6x+ 7.2= 11.4
6x= 11.4-7.2
6x= 4.2
x= 0.7

A+B=111.42
A= 2B
2B+ B=111.42
B= 111.42:3
B= 37.14
A= 37.14×2
A= 74.28

( 24+16):2=40:2=20
(1.2+7.8+2.4):3= 11.4:3=3.8
[1/2+2/3+2.75+0.1(6)] :4=
(3/6+4/6+275/100+15/90):4=
( 7/6+ 55/20+3/18):4=
(7/6+11/4+1/6):4=
( 8/6+11/4):4=
(16/12+33/12):4=
49/12:4/1=49/48=1+1/48