NHƯNG MK THẤY ĐÂY ĐÂU CÓ PHẢI TOÁN CỦA LỚP 5 ĐÂU

LỚP 5 CÓ VẮT ÓC RA CŨNG CHẢ  GIẢI ĐC Á

NHÌN MÀ GIẬT CẢ MK LUN !

Đây đâu phải toán lớp 5?

Dãy đó có số số hạng là

  \(\left(\frac{8}{9}-\frac{1}{9}\right)\div\frac{1}{9}+1=\)\(8\)

Tổng dãy đó là

   \(\left(\frac{1}{9}+\frac{8}{9}\right)\times8\div2=4\)

        Đáp số : 4

\(\frac{1}{9}+\frac{2}{9}+\frac{3}{9}+.....+\frac{7}{9}+\frac{8}{9}\)

= \(\frac{1+2+3+4+5+6+7+8}{9}\)

= \(\frac{36}{9}=4\)

a) \(\frac{59}{42}\)
b) \(\frac{17}{36}\)
c) \(\frac{5}{51}\)
d) \(\frac{4}{7}\)

a: \(\frac56+\frac47=\frac{35}{42}+\frac{24}{42}=\frac{35+24}{42}=\frac{59}{42}\)

b: \(\frac54-\frac79=\frac{45}{36}-\frac{28}{36}=\frac{45-28}{36}=\frac{17}{36}\)

c: \(\frac{15}{17}\times\frac19=\frac{15\times1}{17\times9}=\frac{15}{153}=\frac{5}{51}\)

d: \(\frac37:\frac68=\frac37:\frac34=\frac37\times\frac43=\frac47\)

\(=3\frac{2}{9}-2\frac{7}{9}=\frac{29}{9}-\frac{25}{9}=\frac{4}{9}\)

Chúc bạn học tốt!!!

\(3\frac{2}{9}\)\(-\left(1\frac{5}{9}+1\frac{2}{9}\right)\)

= \(\frac{29}{9}\)\(-\left(\frac{14}{9}+\frac{11}{9}\right)\)

= \(\frac{29}{9}\)\(-\frac{25}{9}\)

= \(\frac{4}{9}\)

B=\(\frac{2002.\left(14+1\right)-1}{2001+2002.14}\)=\(\frac{2002.14+2001}{2001+2002.14}\)=1

Giải hộ mình câu này với:

(215/216+3971/3972-1/5)x(-9/35+2/5-1/7)=..........................?

A=\(\frac{99}{28}\)

B=1

Cả lời giải đi bạn!

a,(11/15+4/15)+(5/7+2/7)

=1+1

=2

b,5/9x(1/2+6/4)

=5/9x2

=10/9

c,1/2:(7/8+9/8)

=1/2:2

=1

d,(17/10-7/10)+1/2

=1+1/2

=3/2

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

\(=2\)

b) \(\frac{5}{9}\times\frac{1}{2}\times\frac{5}{9}\times\frac{6}{4}=\frac{25}{81}\times\frac{3}{4}=\frac{25}{108}\)

c) \(\frac{7}{8}\div\frac{1}{2}+\frac{9}{8}\div\frac{1}{2}=\left(\frac{7}{8}+\frac{9}{8}\right)\div\frac{1}{2}\)

\(=2\div\frac{1}{2}=4\)

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

\(=1+\frac{1}{2}=\frac{3}{2}\)

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) \(\frac{5}{9}.\frac{1}{2}.\frac{5}{9}.\frac{6}{4}\)

\(=\left(\frac{5}{9}\right)^2\left(\frac{1}{2}.\frac{6}{4}\right)\)

\(=\frac{25}{81}.\frac{3}{4}\)

\(=\frac{25}{108}\)

c) \(\frac{7}{8}:\frac{1}{2}+\frac{9}{8}:\frac{1}{2}\)

\(=\frac{7}{8}.2+\frac{9}{8}.2\)

\(=2\left(\frac{7}{8}+\frac{9}{8}\right)\)

\(=2.\frac{16}{8}\)

\(=2.2\)

\(=4\)

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

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

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

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

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

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

=1+1

= 2

b)5/9 x ( 1/ 2 + 6/ 4 )

= 5/9 x 2

=10/9 

c) 17/10-5/10-7/10

=(17-5-7) / 10

= 5/10