Question

Rezolvați ex 5 repede va rog​. Dau coroană

Answer 1

$a) \: 4.3x + 0.5 = x + 2.6$

$4.3x - x = 2.6 - 0.5$

$3.3x = 2.1$

$x = \frac{7}{11}$

$b) \: 3.5x - 3.20 = 0.8x + 7.6$

$3.5x - 0.8x = 7.6 + 3.2$

$2.7x = 10.8$

$x = 4$

$c) \: 5.4x + 1.2x = 4.3x + 7.59$

$6.6x = 4.3x + 7.59$

$6.6x - 4.3x = 7.59$

$2.3x = 7.59$

$x = 3.3$

$d) \: 0.9x \div 4.5 = 18$

$\frac{9}{10}x \div \frac{9}{2} = 18$

$\frac{9}{10} x \times \frac{9}{2} = 18$

$\frac{1}{5} x = 18$

$x = 90$

$e) \: 4.3x + 27.78 = 5.2 x - 6.69$

$4.3x - 5.2x = - 6.69 - 27.78$

$- 0.9x = - 34.47$

$x = 38.3$

$f) \: ({3x - 4.3}) \times 3 = 5.2x - 8.76$

$9x - 12.9 = 5.2 - 8.76$

$9x - 5.2x = 8.76 - 12.9$

$3.8x = 4.14$

$x = \frac{207}{190}$

la punctul f am făcut cu paranteze {...}

doar că nu le-am putut pune