Question

Bài 3 : Tính nhanh

A) 11/15 + 5/7 + 2/7 + 4/15

B) 17/10 + 1/2 - 7/10

Answer 1

a) \(\frac{11}{15}+\frac{5}{7}+\frac{2}{7}+\frac{4}{15}\)

\(=\left(\frac{11}{15}+\frac{4}{15}\right)+\left(\frac{5}{7}+\frac{2}{7}\right)\)

\(=\frac{15}{15}+\frac{7}{7}\)

\(=1+1\)

\(=2\)

b) \(\frac{17}{10}+\frac{1}{2}-\frac{7}{10}\)

\(=\left(\frac{17}{10}-\frac{7}{10}\right)+\frac{1}{2}\)

\(=1+\frac{1}{2}\)

\(=\frac{2}{2}+\frac{1}{2}\)

\(=\frac{3}{2}\)

Answer 2

A)11/15+5/7+2/7+4?15

  =( 11/15+4/15)+(5/7+2/7)

 =1+1

=2

B17/10+1/2-7/10

=17/10-7/10+1/2

=1+1/2

=3/2

k mik nha!

Answer 3

A)\(\frac{11}{15}+\frac{5}{7}+\frac{2}{7}+\frac{4}{15}\)

\(=\left(\frac{11}{15}+\frac{4}{15}\right)+\left(\frac{5}{7}+\frac{2}{7}\right)\)

\(=1+1\)

\(=2\)

b) \(\frac{17}{10}+\frac{1}{2}-\frac{7}{10}\)

\(=\frac{17}{10}-\frac{7}{10}+\frac{1}{2}\)

\(=1+\frac{1}{2}\)

\(=\frac{3}{2}\)

okey nha

nếu mk làm đúng thì hãy ủng hộ mk nha

Answer 4

a)11/15 + 5/7 + 2/7 + 4/15= (5/7 + 2/7)+(11/15 + 4/15)=1 + 1=2

b)17/10 + 1/2 - 7/10 =  17/10 - 7/10 + 1/2 = 1 + 1/2 = 3/2

Answer 5

A)11/15+5/7+2/7+4/15=(11/5+4/15)+(5/7+2/7)=1+1=2

B)17/10+1/2-7/10=(17/10-7/10)+1/2=1+1/2=3/2

Answer 6

a) \(\frac{11}{15}\)+ \(\frac{5}{7}\)+ \(\frac{2}{7}\)+ \(\frac{4}{15}\)

=  \(\frac{77}{105}\)+  \(\frac{75}{105}\) +  \(\frac{30}{105}\) + \(\frac{28}{105}\)

=  \(\frac{210}{105}\) =  \(2\)

Answer 7

11/15 + 5/7 +2/7 +4/15 =11/15 + 4/15 + 5/7 + 2/7 =1 +1 =2                                                                                                                                                                                                                                                                                                                         17/10 +1/2 - 7/10 =17/10 - 7/10 +1/2 = 1 - 1/2  =1/2

Answer 8

b) \(\frac{17}{10}\) + \(\frac{1}{2}\) - \(\frac{7}{10}\)

=  \(\frac{17}{10}\) + \(\frac{5}{10}\)+  \(\frac{-7}{10}\)

=  \(\frac{15}{10}\) =  \(\frac{3}{2}\)