door Ayleen Gill 5 jaren geleden
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x +3(x-1) = 6 -4(2x+3). x+3x-3 = 6-8x-12 x+3x+8x = 6-12+3 12x= -3 x = -3/12 x = – 1/4
4x -(2x+3)(3x-5) = 49 -(6x-1)(x-2). • 4x -(6x^2 -x-15) = 49 -(6x^2 -13x+2) • 4x-6x^2+x+15 = 49-6x^2+13x-2 • 6x^2-6x^2+4x+x-13x = 49-2-15 • -8x = -32 • x =32/-8 x = -4
10(X-9) -9(5-6X) = 2(4X-1) +5(1+2X). . 10X-90-45+54X = 8X-2+5+10X . 10X+54X-8X-10X = -2+5+90+45 . 46X = 138 . X = 138/46 X = 3
X-(2X+1) = 8-(3X+3). • X-2X-1 = 8-3X-3 • X-2X+3X = 8-3+1 • 2X = 6 • X = 6/2 X= 3
5x+{-2x-x+6} = 18-{-7x-6-3x+24} . 5x-2x-x+6 = 18+7x+6+3x-24 . 5x-2x-x-7x-3x= 18+6-24-6 . -8x = -6 . x = -6/-8 x = 3/4
(5-3x) - (-4x+6) = (8x+11) - (3x-6). 5-3x+4x-6 = 8x+11-3x+6 -3x+4x-8x+3x = 11+6-5+6 -4x = 18 x = 18/-4 x = – 9/2
Problems
Subtema
Marta is 15 years old, which is one third of her mother's age. How old is Marta's mother?
We call the age of the mother. The third part of the mother's age is the same as Marta's, that is, 15. Mathematically written: x / 3 = 15