x/2 + x+x/3 + x+x+x/4 = 23/12
giup minh nha
ai có câu trả lời đầy đủ mình sẽ tick
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
X × 2 + X × 3 + X × 4 + X = 2130.
= X × 2 + X × 3 + X × 4 + X × 1 = 2130
= X × ( 2 + 3 + 4 + 1 ) = 2130
= X × 10 = 2130
X = 2130 : 10
X = 213
HT NHA
2/3 x 3/4 x 4/5 : 1/5 = 6/12 x 4/5 :1/5 = 24/60 :1/5 = 4/10 : 1/5 = 4/10 x 5/1 = 20/10 = 2
2/5 x 3/4 x 5/6 : 3/4 = 6/20 x 5/6 : 3/4 = 3/10 x 5/6 : 3/4 = 15/60 : 3/4 = 1/4 : 3/4 = 1/4 x 4/3 = 4/12 = 1/3
k cho mk nha!
\(\frac{2}{3}\times\frac{1}{5}+\frac{3}{10}\times\frac{2}{3}+\frac{4}{6}\times\frac{1}{2}\)
\(=\frac{2}{3}\times\frac{1}{5}+\frac{3}{10}\times\frac{2}{3}+\frac{2}{3}\times\frac{1}{2}\)
\(=\frac{2}{3}\times\left(\frac{1}{5}+\frac{3}{10}+\frac{1}{2}\right)\)
\(=\frac{2}{3}\times\frac{10}{10}\)
\(=\frac{2}{3}\)
\(\frac{1}{2}x+x-\frac{7}{2}x=21-\frac{1}{4}x\)
\(-2x=21-\frac{1}{4}x\)
\(-2x+\frac{1}{4}x=21\)
\(\frac{-7}{4}x=21\)
\(x=-12\)
Chị gái xinh đẹp à. Câu hỏi của chị khó quá ko ai trả lời. Thôi thì.......k cho mem đi😉
a; 60 \(\times\) (\(\dfrac{7}{12}\) + \(\dfrac{4}{15}\))
= 60 \(\times\) \(\dfrac{7}{12}\) + 60 \(\times\) \(\dfrac{4}{15}\)
= 35 + 16
= 51
a,\(60\times\left(\frac{7}{12}+\frac{4}{15}\right)\)\(=\frac{60\times7}{12}+\frac{60\times4}{15}\)
\(=\frac{12\times5\times7}{12}+\frac{15\times4\times4}{15}\)
\(=5\times7+4\times4\)
\(=35+16\)
\(=51\)
b, \(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{8}{9}\)\(=\frac{1\times2\times3\times4\times5\times6\times7\times8}{2\times3\times4\times5\times6\times7\times8\times9}\)
\(=\frac{1}{9}\)
yx1/2+y-yx7/2=21-yx1/4 =>yx1/2+y-yx7/2+yx1/4=21
=>y x (1/2+1-7/2+1/4)=21 => y x (-7/4)=21 =>y=21:(-7/4)=21 x (4/-7)=-12
Bài 2:
Ta có: 2300=23x100=(23)100=8100
3200=32x100=(32)100=9100
Vì:8100<9100
==> 2300>3200
\(\frac{x}{2}+x+\frac{x}{3}+x+x+\frac{x}{4}=\frac{23}{12}\)
\(\left(\frac{x}{2}+\frac{x}{3}+\frac{x}{4}\right)+\left(x+x+x\right)=\frac{23}{12}\)
\(\frac{3x}{12}+\frac{36x}{12}=\frac{23}{12}\)
\(\frac{49x}{12}=\frac{23}{12}\)
\(\frac{49}{12}.x=\frac{23}{12}\)
\(x=\frac{23}{12}:\frac{49}{12}=\frac{23}{49}\)