Question

Rezolvati ecuatiile: 5(10×+3)+3(1-3×)=5(8×+4)+3; b)3(5×-7)+2(2×+17)=5(3×-4)+37; c) 8(3×-2)-13×=5(12-3×)+×-19; d) 17(2-3×)+5(5×-6)=4(3-8×)+10 ;

Answer 1

Răspuns:

Explicație pas cu pas:

a)5(10x+3)+3(1-3x)=5(8x+4)+3

50x+15+3-9x=40x+20+3

41x+18=40x+23

41x-40x=23-18

x=5

b)3(5x-7)+2(2x+17)=5(3x-4)+37

15x-21+4x+34=15x-20+37

19x+13=15x+17

19x-15x=17-13

4x=4

x=4:4

x=1

c)8(3x-2)-13x=5(12-3x)+x-19

24x-16-13x=60-15x+x-19

11x-16=41-14x

11x+14x=41+16

25x=57

x=57/25

d)17(2-3x)+5(5x-6)=4(3-8x)+10

34-51x+25x-30=12-32x+10

4-26x=22-32x

-26x+32x=22-4

6x=18

x=3