\(C=\frac{38}{45}-\left(\frac{8}{45}-\frac{17}{51}-\frac{3}{11}\right)\\ =\frac{38}{45}-\frac{8}{45}+\frac{1}{3}+\frac{3}{11}\\ =\frac{30}{45}+\frac{1}{3}+\frac{3}{11}\\ =\frac{2}{3}+\frac{1}{3}+\frac{3}{11}\\ =1+\frac{3}{11}=\frac{14}{11}\)

Chúc bạn học tốt nha.

lam gium mk con D luon v

bằng \(\frac{4831}{3960}\)

\(\frac{38}{48}-\left(\frac{8}{45}-\frac{17}{51}-\frac{3}{11}\right)\)

\(=\frac{38}{48}-\left(-\frac{212}{495}\right)\)

\(=\frac{4831}{3960}\)

\(A=\frac{38}{45}-\left(\frac{8}{45}-\frac{17}{51}-\frac{3}{11}\right)\)

\(A=\frac{38}{45}-\frac{8}{45}+\frac{17}{51}+\frac{3}{11}\)

\(A=\left(\frac{38}{45}-\frac{8}{45}\right)+\frac{1}{3}+\frac{3}{11}\)

\(A=\left(\frac{2}{3}+\frac{1}{3}\right)+\frac{3}{11}\)

\(A=1+\frac{3}{11}\)

\(A=\frac{11}{11}+\frac{3}{11}=\frac{14}{11}\)

\(B=\left(\frac{1}{2}+1\right).\left(\frac{1}{3}+1\right).\left(\frac{1}{4}+1\right)...\left(\frac{1}{99}+1\right)\)

\(B=\frac{3}{2}.\frac{4}{3}.\frac{5}{4}.\frac{6}{5}...\frac{100}{99}\)

\(B=\frac{3.4.5.6...100}{2.3.4.5...99}\)

\(B=\frac{100}{2}\)

\(B=50\)

a)

\(\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)\)

= \(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}-\frac{79}{67}+\frac{28}{41}\)

= \(\frac{1}{3}+\left(\frac{12}{67}-\frac{79}{67}\right)+\left(\frac{13}{41}+\frac{28}{41}\right)\)

= \(\frac{1}{3}+\left(-1\right)+1\)

= \(\frac{1}{3}+0=\frac{1}{3}\)

b)

\(\frac{38}{45}-\left(\frac{8}{45}-\frac{17}{51}-\frac{3}{11}\right)\)

= \(\frac{38}{45}-\frac{8}{45}+\frac{17}{51}+\frac{3}{11}\)

= \(\left(\frac{38}{45}-\frac{8}{45}\right)+\left(\frac{17}{51}+\frac{3}{11}\right)\)

= \(\frac{2}{3}+\frac{20}{33}\)

= \(\frac{14}{11}\)

Trả lời

b)(1/3+12/67+13/41)-(79/67-28/41)

=1/3+12/67+13/41-79/67+28/41

=1/3+(12/67-79/67)+(13/41+28/41)

=1/3+(-67/67)+41/41

=1/3+(-1)+1

=1/3+0

=1/3.

c)38/45-(8/45-17/51-3/11)

=38/45-8/45+17/51+3/11

=30/45+1/3+3/11

=2/3+1/3+3/11

=3/3+3/11

=1+3/11

=1 3/11.

a) 31/23 - ( 7/32 + 8/22)

= 31/23 - 7/32 + 8/23

= ( 31/23 + 8/23 ) - 7/32

= 32/22 - 7/32

= 39/32

Ccá ý khác làm tương tự

=(31\23-8\23)+7\32

=23\23+7\32

=1+7\32

=39\32

a)   \(\frac{31}{23}-\left(\frac{7}{32}+\frac{8}{23}\right)=\frac{31}{23}-\frac{7}{32}-\frac{8}{23}=1-\frac{7}{32}=\frac{25}{32}\)

b)   \(\left(\frac{1}{3}+\frac{12}{67}+\frac{13}{41}\right)-\left(\frac{79}{67}-\frac{28}{41}\right)\)

\(=\frac{1}{3}+\frac{12}{67}+\frac{13}{41}-\frac{79}{67}+\frac{28}{41}\)

\(=\frac{1}{3}-\left(\frac{79}{67}-\frac{12}{67}\right)+\left(\frac{13}{41}+\frac{28}{41}\right)\)

\(=\frac{1}{3}-1+1=\frac{1}{3}\)

d)   \(\frac{1}{7}.\frac{1}{3}+\frac{1}{7}.\frac{-1}{3}+\frac{17}{19}=\frac{1}{7}.\left(\frac{1}{3}-\frac{1}{3}\right)+\frac{17}{19}=\frac{17}{19}\)

e)  \(\frac{3}{5}.\frac{7}{9}+\frac{7}{5}.\frac{2}{9}=\frac{7}{5}.\left(\frac{3}{9}+\frac{2}{9}\right)=\frac{7}{5}.\frac{5}{9}=\frac{7}{9}\)

1) = 1/3

2) = 14/11

3) = 1

4) = 7/9