Question

Bài 1:

\(\frac{7}{12}+\frac{-8}{15}\) ; \(\frac{5}{12}+\frac{-8}{15}\)

Bài 2: Tìm x

a)x - 23 =-56

b)2x - 36 = 24

c)x - \(\frac{4}{5}=\frac{3}{2}\)

d)x - 46 =123

e)2x - 25= -45

f)x -\(\frac{2}{3}=\frac{-7}{5}\)

mn ơi giúp em vs trước tối nay có nha mn

cảm ơn mn

Answer 1

Bài 1:

\(\frac{7}{12}+\frac{-8}{15}=\frac{7}{12}-\frac{8}{15}=\frac{35}{60}-\frac{32}{60}=\frac{3}{60}=\frac{1}{20}\)

\(\frac{5}{12}+\frac{-8}{15}=\frac{5}{12}-\frac{8}{15}=\frac{25}{60}-\frac{32}{60}=\frac{-7}{60}\)

Bài 2:

\(a,x-23=-56\)

\(x=-56+23\)

\(x=-33\)

\(b,2x-36=24\)

\(2x=60\)

\(x=30\)

\(c,x-\frac{4}{5}=\frac{3}{2}\)

\(x=\frac{3}{2}+\frac{4}{5}=\frac{23}{10}\)

\(d,x-46=123\)

\(x=123+46=169\)

\(e,2x-25=-45\)

\(2x=-20\)

\(x=-10\)

\(f,x-\frac{2}{3}=-\frac{7}{5}\)

\(x=-\frac{7}{5}+\frac{2}{3}=-\frac{11}{15}\)

=.= hk tốt!!