\(a)\)\(\left(50-6.x\right).18=2^3.3^2.5\)
\(\Leftrightarrow\)\(\left(50-6.x\right).18=8.9.5\)
\(\Leftrightarrow\)\(\left(50-6.x\right).18=360\)
\(\Leftrightarrow\)\(\left(50-6.x\right)=360\div18\)
\(\Leftrightarrow\)\(50-6.x=20\)
\(\Leftrightarrow\)\(6.x=50-20\)
\(\Leftrightarrow\)\(6.x=30\)
\(\Leftrightarrow\)\(x=5\)
\(b)\)\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=7450\)
\(\Leftrightarrow\)\(100x+\left(1+2+3+...+100\right)=7450\)
\(\Leftrightarrow\)\(100x+5050=7450\)
\(\Leftrightarrow\)\(100x=7450-5050\)
\(\Leftrightarrow\)\(100x=2400\)
\(\Leftrightarrow\)\(x=24\)
b.
(x+1)+(x+2)+...+(x+100)=7450
=> 100x + (1+2+3+...+100)=7450
=>100x + (100+1).50=7450
=>100x=2400
=>x=24
(x+1)+(x+2)+(x+3)+....(x+100)=7450
=> 100x + (1+2+3...+100)=7450
=> 100x + 5050=7450
=> 100x =7450-5050
=> 100x = 2400
=> x= 24
TL :
x = 5
_HT_
sai thì mong bn thông cảm.
(50−6x).18=23.32.5(50−6x).18=23.32.5
⇒ (50−6x).18=8.9.5(50−6x).18=8.9.5
⇒ (50−6x).18=360(50−6x).18=360
⇒ 50−6x=2050−6x=20
⇒ 6x=50−206x=50−20
⇒ 6x=306x=30
⇒ x=5x=5
Vậy x=5
Đáp án là x=5!
#TEAM.Lục Đại Khuyển Vương.I'm Nhị
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(50−6x).18=23.32.5(50−6x).18=23.32.5
⇒ (50−6x).18=8.9.5(50−6x).18=8.9.5
⇒ (50−6x).18=360(50−6x).18=360
⇒ 50−6x=2050−6x=20
⇒ 6x=50−206x=50−20
⇒ 6x=306x=30
⇒ x=5x=5
Vậy x=5