Question

[Nhật Phi]

Bài 3: Cim x a, 15: (x+2)=3 20.(1+x)=2 c) 240. (x-5):22 52-20 cl, 96-3(x+1)-42 e) 5 (x+35): 515 12 x - 33 = 3^2.3^3 g, 541+(218-x)=73 h, 1230:3(x-207-10

Answer 1

[Nguyễn Lê Phước Thịnh]

a: 15:(x+2)=3

=>\(x+2=\dfrac{15}{3}=5\)

=>x=5-2=3

b: 20(1+x)=2

=>\(x+1=\dfrac{2}{20}=\dfrac{1}{10}\)

=>\(x=\dfrac{1}{10}-1=-\dfrac{9}{10}\)

f: \(12x-33=3^2\cdot3^3\)

=>\(12x-33=3^5=243\)

=>12x=243+33=276

=>\(x=\dfrac{276}{12}=23\)

g: 541+(218-x)=73

=>218-x=73-541=-468

=>x=218+468=686