Question

sa se rezolve ecuatiile : x+1/5=3/2; b) x/3-1/2=7/8 ;c) 2/5x=5/2-3/4
Ajutatima va rog si la celelalte doua intrebari !
Dau coroana !

Answer 1

(X+1)/5 = 3/2
2(X+1) = 15
2X+2 = 15
2X = 15-2
2X = 13
X = 13/2
X = 6,5

X/3 - 1/2 = 7/8
2X/6 - 3/6 = 7/8
(2X-3)/6 = 7/8
8(2X-3) = 6×7
16X-24 = 42
16X = 42+24
16X = 66
X = 66/16
X = 4,125

2/5X = 5/2 - 3/4
25X= 10/4 - 3/4
25X = 7/4
25X×4 = 7
100X = 7
X = 7/100
X = 0,07