Temat: Rozwiązywanie równań. Oblicz: a) x - 5x - 7 = 8x - 4 b) -20x - x +7 + 13 = 20x + 10x c) -4x - x + 5 = 15 + 5 + 5x - x d) -8x - 2 - 5 = -10x - 15x e) -2 + 5x = - 7x + 16 ----------------------------------------------------------- To na jutro

Chyba dobrze.C..... .

x-5x-7=8x-4 -4x-8x=-4+7 -12x=3 x=-3/12=-1/4 spr. L=-1/4-5*(-1/4)-7=-1/4+5/4-7=-6/4-7=-6 2/4-7=-8 1/2 P=8*(-1/4)-4=-8/4-4=-2-4=-6 L=P b/ -20x-x+7+13=20x+10x -21x-30x=-20 -51x=-20 x=20/51 spr. L = -20*20/51-20/51+7+13=-400/51 - -20/ 51+20= -7 43/51-20/51+20=-7 63/51+20= =-8 12/51+20=11 39/51 P= 20*20/51+10*20/51=400/51+200/51= =7 43/51+3 47/51=10 90/51=11 39/51 L=P c/ -4x-x+5=15+5+5x-x -5x-4x=-5+20 -9x=15 x=-15/9 spr. L=-4*(-15/9)-(-15/9)+5=60/9+15/9+5=75/9+5= =8 3/9+5=13 1/3 P= 15+5+5*(-15/9)-(-15/9)=20-75/9+15/9=20-60/9=20- 6 6/9=20- -6 2/3= 13 1/3 L=P d/ -8x-2-5=-10x-15x -8x+25x=7 17x=7 x=7/17 spr. L=-8*7/17-2-5=-56/17-7=-3 5/17-7=-10 5/17 P=-10*7/17-15*7/17=-70/17-105/17=-175/17=. -10 5/17 L=P e/ -2+5x=-7x+16 5x+7x=16+2 12x=18 x=18/12 spr. L= -2+5*18/12=-2+90/12=-2+7 6/12= 5 1/2 P= -7*18/12+16= -126/12+16=- 10 6/12+16= 5 6/12= 5 1/2 L=P