=10,5.4,8-2,4

=50,4-2,4

=48

=35,16-11,21+374,4

=23,95+374,4

=398,35

\(-23.63+23.21-58.23\)
\(=-23.\left(63+21-58\right)\)
\(=-23.26\)
\(=-598\)
k mik nha

nhung lai co 2 so 23 va 1 so -23 nen lam the la sai

Sao cau lai ghi la ko mik nha la j vay

\(\dfrac{1}{4}-\dfrac{1}{3}+\dfrac{5}{12}\\ =\dfrac{3}{12}-\dfrac{4}{12}+\dfrac{5}{12}\\ =\dfrac{3-4+5}{12}\\ =\dfrac{4}{12}\\ =\dfrac{1}{3}\)

\(\left(1-\frac{1}{3}\right).\left(1-\frac{1}{6}\right).\left(1-\frac{1}{10}\right)...\left(1-\frac{1}{190}\right)\)

\(=\frac{2}{3}.\frac{5}{6}.\frac{9}{10}...\frac{189}{190}\)

\(=\frac{4}{6}.\frac{10}{12}.\frac{18}{20}...\frac{378}{380}\)

\(=\frac{1.4}{2.3}.\frac{2.5}{3.4}.\frac{3.6}{4.5}...\frac{18.21}{19.20}\)

\(=\frac{1.2.3...18}{2.3.4...19}.\frac{4.5.6...21}{3.4.5...20}\)

\(=\frac{1}{19}.\frac{21}{3}\)

\(=\frac{1}{19}.7=\frac{7}{19}\)

\(\left(1-\frac{1}{3}\right).\left(1-\frac{1}{6}\right).\left(1-\frac{1}{10}\right)...\left(1-\frac{1}{190}\right)\)

\(=\frac{2}{3}.\frac{5}{6}.\frac{9}{10}....\frac{189}{190}\)

\(=\frac{4}{6}.\frac{10}{12}.\frac{18}{20}....\frac{378}{380}\)

\(=\frac{1.4}{2.3}.\frac{2.5}{3.4}.\frac{3.6}{4.5}....\frac{18.21}{19.20}\)

\(=\frac{1.2.3....18}{2.3.4....19}.\frac{4.5.6...21}{3.4.5....20}\)

\(=\frac{1}{19}.\frac{21}{3}\)

\(=\frac{1}{19}.7=\frac{7}{19}\)

Ủng hộ mk nha !!! ^_^

lúc đầu hộp 1 có 16 kg chè

30-[50-(9-4)²]+2015⁰

=30-[50-5²]+2015⁰

=30-[50-25]+2015⁰

=30-25+2015⁰

=30-25+1

=5+1

=6