Question

Bài 1 Tìm X

a) x/3 = 2/3 + -1/7

b) x - 1/4 = 2/13

c) 4/7. x = 9/8 - 125/1000

Answer 1

Bài làm:

a) \(\frac{x}{3}=\frac{2}{3}+\left(-\frac{1}{7}\right)\)

<=>\(\frac{x}{3}=\frac{2.7-1.3}{3.7}\)

<=>\(\frac{x}{3}=\frac{11}{21}\)

<=> \(21.x=33\)

<=> \(x=\frac{11}{7}\)

b) \(x-\frac{1}{4}=\frac{2}{13}\)

<=> \(x=\frac{1}{4}+\frac{2}{13}\)

<=> \(x=\frac{13.1+2.4}{4.13}\)

<=> \(x=\frac{21}{52}\)

c)\(\frac{4}{7}.x=\frac{9}{8}-\frac{125}{1000}\)

<=> \(\frac{4}{7}.x=\frac{9}{8}-\frac{1}{8}\)

<=> \(\frac{4}{7}.x=\frac{8}{8}\)

<=> \(x=1:\frac{4}{7}\)

<=> \(x=\frac{7}{4}\)

Học tốt!!!!

Answer 2

7 + 67 + 56 - 76 + 368 -  93 + 45 -88 =

 =?      ?      ?     ?        ?       ?     ?

=        ?            ?          ?       ?        ?

=   ?

Answer 3

x=4573

Answer 4

Tinh nhanh 4,25×17,8+4,25×46+4,25×36

Answer 5

a,\(\frac{x}{3}=\frac{2}{3}-\frac{1}{7}=\frac{11}{21}\)

\(< =>x.21=33< =>x=\frac{33}{21}\)

b,\(x-\frac{1}{4}=\frac{2}{13}\)

\(< =>x=\frac{2}{13}+\frac{1}{4}=\frac{21}{52}\)

c,\(\frac{4}{7}.x=\frac{9}{8}-\frac{125}{1000}=1\)

\(< =>x=1:\frac{4}{7}=\frac{7}{4}\)

Answer 6

Bài 1.

\(a)\)\(\frac{x}{3}=\frac{2}{3}+\frac{-1}{7}\)

\(\Leftrightarrow\frac{x}{3}=\frac{14}{21}+\frac{-3}{21}\)

\(\Leftrightarrow\frac{x}{3}=\frac{11}{21}\)

\(\Leftrightarrow21x=33\)

\(\Leftrightarrow x=\frac{11}{7}\)

Vậy\(x=\frac{11}{7}\)

\(b)\)\(x-\frac{1}{4}=\frac{2}{13}\)

\(\Leftrightarrow x=\frac{2}{13}+\frac{1}{4}\)

\(\Leftrightarrow x=\frac{8}{52}+\frac{13}{52}\)

\(\Leftrightarrow x=\frac{21}{52}\)

Vậy\(x=\frac{21}{52}\)

\(c)\)\(\frac{4}{7}x=\frac{9}{8}-\frac{125}{1000}\)

\(\Leftrightarrow\frac{4}{7}x=\frac{9}{8}-\frac{1}{8}\)

\(\Leftrightarrow\frac{4}{7}x=1\)

\(\Leftrightarrow x=\frac{7}{4}\)

Vậy\(x=\frac{7}{4}\)

Linz