15x(197+3)=15x200=3000

   15 x 3 + 15 x 197 

= 15 x ( 3 + 197 ) 

= 15 x 200

=   3000

(9+1)+(8+2)+(7+3)+(6+4)+10+5

=10+10+10+10+10+5=45

9+3+2+1+7+8+5+10+6+4= (9+1)+(2+8)+(3+7)+(4+6)+5=10+10+10+10+5=10.4+5=40+5=45

4\5:2\7-1\8

trang oi

376 x 29 + 70 x 376 + 376

= 376 x 29 + 70 x 376 + 376 x 1

= 376 x (29 + 70 + 1)

= 376 x 100

= 37600

Sửa đề:

376 × 29  + 70 × 376 + 376

= 376 × (29 + 70 + 1)

= 376 × 100

= 37600

0,92 x 324 + 0,92 x 676

= 0,92 x ( 324 + 676)

= 9,92 x 1000

= 920

0,92 x 324 + 0,92 x 676

= 0,92 x ( 324 + 676)

= 0,92 x 1000

= 920

a: \(\frac{5}{11}\times\frac{7}{25}+\frac{15}{11}\times\frac15\)

\(=\frac{7}{11\times5}+\frac{3}{11}=\frac{7+3\times5}{11\times5}=\frac{22}{55}=\frac25\)

b: \(\frac37\times\frac{25}{19}-\frac17\times\frac{18}{19}\)

\(=\frac{75}{7\times19}-\frac{18}{7\times19}=\frac{57}{7\times19}=\frac37\)

dấu(*) là dấu gì vậy bạn?

Xin đừng gửi nữa

\(\frac{5}{11}.\frac{7}{25}+\frac{15}{11}.\frac{1}{5}\)

\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.3.\frac{1}{5}\)

\(=\frac{5}{11}.\frac{7}{25}+\frac{5}{11}.\frac{3}{5}\)

\(=\frac{5}{11}\left(\frac{7}{25}+\frac{3}{5}\right)\)

\(=\frac{5}{11}\left(\frac{7}{25}+\frac{15}{25}\right)\)

\(=\frac{5}{11}.\frac{22}{25}=\frac{2}{5}\)

2/5 nhé

(112+88)+(36+44)

=200+80

=280

= (36+44)+(112+88)

=    80      +  200

=   280