-3,75.(-7,2)+2,8.3,75=3,75.7,2+2,8.3,75=3,75.10=37.5

I'm thanks very much

=37,5

\(\left(-3,75\right).\left(-7,2\right)+2,8.3,75\)

\(=3,75.7,2+2,8.3,75\)

\(=3,75\left(7,2+2,8\right)\)

\(=3,75.10\)

\(=37,5\)

\(\left(-3,75\right)\left(-7,2\right)+2,8.3,75=3,75.7,2+2,8.3,75=\dfrac{15}{4}.\dfrac{36}{5}+\dfrac{14}{5}.\dfrac{15}{4}=\dfrac{15}{4}\left(\dfrac{36}{5}+\dfrac{14}{5}\right)=\dfrac{15}{4}.10=\dfrac{75}{2}=37.5\)

a: \(123+26\cdot34+\left(-123\right)+26\cdot66\)

\(=123-123+26\cdot34+26\cdot66\)

\(=26\cdot\left(34+66\right)=26\cdot100=2600\)

b: -216-(-216+34)-20

=-216+216-34-20

=-34-20

=-54

a. 9/7 < 11/13

b. 12/17 > 5/36

hợp lí á bạn

a: \(-0,25:\frac14+\left|\frac34+\frac53\right|-9\cdot\sqrt{\frac{25}{81}}+\sqrt{\left(-5\right)^2}\)

\(=-\frac14\cdot4+\frac34+\frac53-9\cdot\frac59+5\)

\(=-1+\frac{9}{12}+\frac{20}{12}-5+5=-1+\frac{29}{12}=\frac{17}{12}\)

a) \(9\cdot3^2\cdot\dfrac{1}{81}=\dfrac{9\cdot9}{81}=\dfrac{81}{81}=1\)

b) \(2\dfrac{1}{2}+\dfrac{4}{7}:\left(-\dfrac{8}{9}\right)\)\(=\dfrac{5}{2}+\dfrac{4}{7}\cdot\left(-\dfrac{9}{8}\right)\)

\(=\dfrac{5}{2}-\dfrac{9}{14}\)\(=\dfrac{35}{14}-\dfrac{9}{14}=\dfrac{26}{14}=\dfrac{13}{7}\)

c) \(3,75\cdot7,2+2,8\cdot3,75=3,75\left(7,2+2,8\right)=3,75\cdot10=37,5\)

a: Cách 1: A={B;A;C;H;Đ;Ă;N;G}

Cách 2: A={x∈bảng chữ cái tiếng Việt|x nằm trong từ BẠCH ĐẰNG}

b: Cách 1: B={1;2;3;4;5;6}

Cách 2: B={x∈N|0<x<7}

c: Cách 1: C={16;17;18;19}

Cách 2: C={x∈N|15<x<20}