Question

[Phan van anh]

bài1

d)\(\left(-45,7\right)+[\left(+5,7\right)+\left(+5,75\right)+\left(-0,75\right)]\)

e)\(11,26-5,13\div\left(5\frac{5}{18}-1\frac{8}{9}\cdot1,25+1\frac{16}{63}\right)\)

j)\(\sqrt{8^2+6^2}\sqrt{16}+\frac{1}{2}\cdot\sqrt{\frac{4}{5}}\)

h)\(\left(-1+3\frac{2}{5}+\frac{1}{4}\right)\cdot\left(-4\right)\)

cac ban giupmminh nha ngay mai minh kiem tra mon toan

Answer 1

[Huỳnh Quang Sang]

d) \(\left(-45,7\right)+\left[\left(+5,7\right)+\left(+5,75\right)+\left(-0,75\right)\right]\)

\(=\left(-45,7\right)+\left[5,7+5,75-0,75\right]\)

\(=\left(-45,7\right)+5,7+5,75-0,75\)

\(=\left[\left(-45,7+5,7\right)\right]+\left[5,75-0,75\right]\)

\(=-40+5=-35\)

e) \(11,26-5,13:\left(5\frac{5}{18}-1\frac{8}{9}\cdot1,25+1\frac{16}{63}\right)\)

\(=11,26-5,13:\left(\frac{95}{18}-\frac{17}{9}\cdot\frac{5}{4}+\frac{79}{63}\right)\)

\(=11,26-5,13:\left(\frac{95}{18}-\frac{85}{36}+\frac{79}{63}\right)\)

\(=\frac{563}{50}-\frac{513}{100}:\frac{1051}{252}\)

\(=\frac{563}{50}-\frac{513}{100}\cdot\frac{252}{1051}\)

\(=\frac{563}{50}-\frac{129276}{105100}=\frac{21083}{2102}\)

Số lớn quá!

j) \(\sqrt{8^2+6^2}\cdot\sqrt{16}+\frac{1}{2}\cdot\sqrt{\frac{4}{5}}\)

\(=\sqrt{64+36}\cdot\sqrt{16}+\frac{1}{2}\cdot\sqrt{\frac{4}{5}}\)

\(=\sqrt{100}\cdot4+\frac{1}{2}\cdot\frac{2\sqrt{5}}{5}\)

\(=10\cdot4+\frac{\sqrt{5}}{5}=40+\frac{\sqrt{5}}{5}=\frac{200+\sqrt{5}}{5}\)

h) Cái đây mình có làm rồi