Question

Rezolavati ecuatiile(sunt siple de clasa 5 ) :
1)6*(2x+1)=78
2)7*(3x-2)=70
3)2*(x+5)-7=19
4)4*(3x+2)+15=71
5)3x+4x=28
6)5x+x-2x=36
7)9x-4x+11=3x-x+44
8)3*(x+7)+2(x-10)=21
9)x*(9X-10)*(X-12)=0
*-este inmultirea

Answer 1

1)6(2x+1)=78 12x+6=78 12x=72 x=6 2)7(3x-3)=70 21x-14=70 21x=84 x=4 3)2(x+5)-7=19 2x-10=26 2x=36 x=18 4)4(3x+2)+15=71 12x+8=56 12x=48 x=4 5)3x+4x=28 7x=28 x=4 6)5x+x-2x=36 4x=36 x=9 7)9x-4x+11=3x-x+44 5x+11=2x+44 5x-2x=44-11 3x=33 x=11 8)3(x+7)+2(x-10)=21 3x+21+2x-20=21 5x+1=21 5x=20 x=4 9)=nu mai stiu cum se face