Question

Answer 1

Câu 2: 

a. 541 + (218 - x) = 735

<=> 218 - x = 735 - 541

<=> 218 - x = 194

<=> -x = 194 - 218

<=> -x = -24

<=> x = 24

b. 5(x + 35) = 515

<=> 5x + 175 = 515

<=> 5x = 515 - 175

<=> 5x = 340

<=> x = 68

c. 96 - 3(x + 1) = 42

<=> 96 - 3x - 3 = 42

<=> -3x = 42 + 3 - 96

<=> -3x = -51

<=> x = \(\dfrac{-51}{-3}=17\)

d. 12x - 33 = 3² . 3³

<=> 12x - 33 = 3^{2 + 3}

<=> 12x - 33 = 3⁵

<=> 12x - 33 = 243

<=> 12x = 243 + 33

<=> 12x = 276

<=> x = 23

Answer 2

Câu 3: a. Ư₍₉₆₎ \(\in\left\{3;4;16;96\right\}\)

b. Ư₍₁₃₀₎ > 20 \(\in\left\{26;65;130\right\}\)

c. 50 < B₍₁₅₎ < 150

=> B₍₁₅₎ \(\in\left\{60;75;90;105;120;135;150\right\}\)

d. Ư₍₃₀₎ > 240 \(\in\left\{1;2;3;5;6;10;15;30\right\}\)