Question

[Bảo Ngân]

3\(\frac{3}{4}\)+ (4 \(\frac{2}{4}\)- 3\(\frac{1}{2}\)) : \(\frac{3}{4}\)

7 × \(\frac{2}{3}\)- \(\frac{2}{5}\): \(\frac{1}{2}\)- \(\frac{2}{3}\)

68,7 - 100 : 20 + 70,8

( 5915 + 445 : 5 ) - 76 × 25

Answer 1

[Phạm Hàn Minh Chương]

  \(a.\) \(3\frac{3}{4}+\left(4\frac{2}{4}-3\frac{1}{2}\right):\frac{3}{4}\)

\(=\frac{15}{4}\left(\frac{18}{4}-\frac{7}{2}\right):\frac{3}{4}\)

\(=\frac{15}{4}+\frac{4}{4}:\frac{3}{4}=\frac{15}{4}+\frac{4}{3}\)

\(=\frac{15}{4}+\frac{4}{3}=\frac{61}{12}\)

\(b.\) \(7\cdot\frac{2}{3}-\frac{2}{5}:\frac{1}{2}-\frac{2}{3}\)

\(=\frac{7}{3}-\frac{2}{5}\cdot2-\frac{2}{3}\)

\(=\frac{7}{3}-\frac{4}{5}-\frac{2}{3}=\frac{35-12-10}{15}\)

\(=\frac{13}{15}\)

\(c.\) \(68,7-100:20+70,8\)

\(=68,7-5+70,8\)

\(=63,7+70,8\)

\(=134,5\)

\(d.\)\(\left(5915+445:5\right)-76\cdot25\)

\(=\left(5915+89\right)-1900\)

\(=6004-1900=4104\)

Answer 2

[Nguyễn Văn Quyến]

a)=\(\frac{15}{4}+\left(\frac{18}{4}-\frac{7}{2}\right)\)/ \(\frac{3}{4}\)

=\(\left(\frac{33}{4}-\frac{14}{4}\right)\)/ \(\frac{3}{4}\)

= \(\frac{19}{4}\cdot\frac{4}{3}\)

=\(\frac{19}{3}\)

b) = \(\frac{2}{3}\cdot\left(7-1\right)-\frac{2}{5}\cdot\frac{2}{1}\)

= \(\frac{2}{3}\cdot6-\frac{4}{5}\)

= 1-\(\frac{4}{5}\)

= \(\frac{1}{5}\)

c) = 68.7 - 5 + 70.8 

= 63.7 + 70.8

=134.5

d) = (5915 - 89) -76*25

= 5826 - 1900

= 3926