Thu nhập hàng tháng mỗi người:

\(2400000\cdot\dfrac{3}{4}=1800000\left(đ\right)\)

ủa sao tui lại có vip?

đổi 625/10000=1/16

đổi 75/10=7,5

số lớn : 7,5 : (16-1) x 16 = 8

số bé : 8 - 7,5 = 0,5

chúc bạn thành công

3 x y+7/16 = 2

3 x y = 2 - 7/16

3 x y = 25/16

y = 25/16 : 3

y = 25/48

Nếu phép chia đó không dư thì tổng 2 số:

\(220-5=215\)

Số bé là:

\(215:\left(1+4\right)\cdot4=43\)

Số lớn:

\(220-43=177\)

Nice

\(\dfrac{242}{363}+\dfrac{1616}{2121}=\dfrac{2}{7}y\)

\(\dfrac{2\cdot121}{3\cdot121}+\dfrac{16\cdot101}{21\cdot101}=\dfrac{2}{7}y\)

\(\dfrac{2}{7}y=\dfrac{2}{3}+\dfrac{16}{21}\)

\(\dfrac{2}{7}y=\dfrac{10}{7}\)

\(y=\dfrac{10}{7}\div\dfrac{2}{7}=5\)

nhân y mà

\(15\times\left(32-24\div x\right)-230=70\)

\(15\times\left(32-24\div x\right)=300\)

\(32-24\div x=20\)

\(24\div x=12\)

\(x=2\)

\(15\times\left(32-24:x\right)-230=70\)

\(15\times\left(32-24:x\right)=70+230\)

\(15\times\left(32-24:x\right)=300\)

\(32-24:x=300:15\)

\(32-24:x=20\)

\(24:x=32-20\)

\(24:x=12\)

\(x=24:12\)

\(x=2\)

\(#WendyDang\)

318 = 3,18 tạ

7m² 200cm²= 702dm²

Sửa đề:

\(\dfrac{2}{1\times4}+\dfrac{2}{4\times7}+\dfrac{2}{7\times10}+...+\dfrac{2}{97\times100}\)

\(=2\times\left(\dfrac{1}{1\times4}+\dfrac{1}{4\times7}+\dfrac{1}{7\times10}+...+\dfrac{1}{97\times100}\right)\)

\(=\dfrac{2}{3}\times\left(\dfrac{3}{1\times4}+\dfrac{3}{4\times7}+\dfrac{3}{7\times10}+...+\dfrac{3}{97\times100}\right)\)

\(=\dfrac{2}{3}\times\left(1-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}+-\dfrac{1}{10}+...+\dfrac{1}{97}-\dfrac{1}{100}\right)\)

\(=\dfrac{2}{3}\times\left(1-\dfrac{1}{100}\right)\)

\(=\dfrac{2}{3}\times\dfrac{99}{100}\)

\(=\dfrac{198}{300}\)

\(=\dfrac{33}{50}\)

\(A=1-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}+\dfrac{1}{7}-\dfrac{1}{10}+...+\dfrac{1}{97}-\dfrac{1}{100}\)

\(A=1-\dfrac{1}{100}=\dfrac{99}{100}\)

\(D=\dfrac{1}{1\cdot5}+\dfrac{1}{5\cdot9}+...+\dfrac{1}{21\cdot25}\)

\(4D=\dfrac{4}{1\cdot5}+\dfrac{4}{5\cdot9}+...+\dfrac{4}{21\cdot25}\)

\(4D=1-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{9}+...+\dfrac{1}{21}-\dfrac{1}{25}\)

\(4D=1-\dfrac{1}{25}=\dfrac{24}{25}\)

\(D=\dfrac{24}{25}\cdot\dfrac{1}{4}=\dfrac{4\cdot6}{25\cdot4}=\dfrac{6}{25}\)