Question

Bài 1:Tìm x

a)2(x-51)=2.2²+20

b)3.(x+1)-26=541

c)4(x-3)=7²-1¹⁰

d)2.3^xx-5=7²

e)2x-138=2³.3²

f)(x-1)⁴=16

Bài2:Tìm số tự nhiên liệu x,biết :

a)72:x;60:x và x>6

b)x:5 và 210 <7x<280

 

Answer 1

a) \(\text{2(x-51)=2.2^2+20}\)

\(2\left(x-51\right)=2.4+20\)

\(2\left(x-51\right)=28\)

\(x-51=28\div2\)

\(x-51=14\)

\(x=14+51\)

\(\text{b)3.(x+1)-26=541}\)

\(3.\left(x+1\right)=541+26\)

\(3\cdot\left(x+1\right)=567\)

\(x+1=567\div3\)

\(x+1=189\)

\(x=189-1\)

\(x=188\)

\(x=65\)

\(\text{c)4(x-3)=7^2-1^10}\)

\(4\left(x-3\right)=49-1\)

\(4\left(x-3\right)=48\)

\(x-3=48\div4\)

\(x-3=12\)

\(x=12+3\)

\(x=15\)

\(\text{e)2x-138=2^3.3^2}\)

\(2x-138=8\cdot9\)

\(2x-138=72\)

\(2x=72+138\)

\(2x=210\)

\(x=210\div2\)

\(x=105\)

\(\text{f)(x-1)^4=16}\)

\(\left(x-1\right)^4=2^4\)

\(x-1=2\)

\(x=2+1\)

\(x=3\)