Matematică
jmecherul12345
2016-04-12 20:45:39
rezolvati ecuatiile:6
Răspunsuri la întrebare
pfloxxmwed
2016-04-12 23:34:47

6.a) 2x-7=13 2x=13+7 2x=20 x=20:2=10 b) -7+6x=4x+15 6x-4x=15+7 2x=22 x=22:2=11 c) 5x-11=x-3 5x-x=-3+11 4x=8 x=8:4=4 d) 2,5x-4,7=4,5+6 2,5x-4,5x=6+4,7 -2x=10,7/×(-1) 2x=-10,7 x=-10,7:2 x=-5,35 e) 3x-5+4x=18 7x=18+5 7x=23 x=23:7=3,28 f) 8x+20=3x 8x-3x=-20 5x=-20 x=-20:5=-4 g) 10x-30=24x+28-2 10x-24x=26+30 -14x=56/×(-1) 14x=-56 x=-56:14=4

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