(9x8-12-12x5)x(1+2+3+4+5)

= (72-12-60)x(1+2+3+4+5)

= 0x(1+2+3+4+5)

=0

 ( 9 x 8 - 12 - 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )

= ( 3 x 3 x 4 x 2 - 12 - 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )

= ( 6 x 12 - 12 - 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )

= { 12 x ( 6 - 5 - 1 ) } x ( 1 + 2 + 3 + 4 + 5 )

= 12 x 0 x ( 1 + 2 + 3 + 4 + 5 )

= 0

k cho mình nha chúc bạn học tốt

Trả lời :.............................................

( 9 x 8 - 12 - 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )

= 72    -  12 - 60        x    15

=                0 -                    900

= 900

Hk tốt..........................................

k nhé Ter Stegen

= 

giải ra chi tiết giúp mink với ạ

\(4\times126\times25\\ =\left(4\times25\right)\times126\\ =100\times126\\ =12600\)

\(\left(9\times8-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(72-12-60\right)\times15\\ =\left(60-60\right)\times15\\ =0\times15\\ =0\)

\(4\times126\times25=\left(4\times25\right)\times126=100\times126=12600\\ \left(9\times8-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(3\times3\times2\times4-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left(12\times6-12-5\times12\right)\times\left(1+2+3+4+5\right)\\ =\left[12\times\left(6-1-5\right)\right]\times\left(1+2+3+4+5\right)\\ =\left(12\times0\right)\times\left(1+2+3+4+5\right)\\ =0\times\left(1+2+3+4+5\right)=0\)

\(a)\) \(4.126.25=\left(4.25\right).126=100.126=12600\)

a,4x126x25

=(4x25)x126

=100x126

=12600

cảm ơn 2 bn nhé thank you 

a) \(\frac{8}{21}+\frac{13}{21}=\frac{8+13}{21}=\frac{21}{21}=1\)

b) \(\frac{5}{6}:\frac{-7}{12}=\frac{5}{6}.\frac{12}{-7}=\frac{10}{-7}\)

c) \(-4\frac{1}{4}-\frac{3}{4}=\frac{-17}{4}-\frac{3}{4}=\frac{-17-3}{4}=\frac{-20}{4}=-5\)

d) \(\frac{7}{9}.\frac{8}{17}+\frac{7}{9}.\frac{15}{17}-\frac{7}{9}.\frac{6}{17}\)

\(=\frac{7}{9}.\left(\frac{8}{17}+\frac{15}{17}-\frac{6}{17}\right)\)

\(=\frac{7}{9}.\frac{17}{17}\)

\(=\frac{7}{9}.1\)

\(=\frac{7}{9}\)

a) \(\frac{8}{21}+\frac{13}{21}=1\)

b) \(\frac{5}{6}\div\frac{-7}{12}=\frac{5}{6}.\frac{-12}{7}=\frac{-10}{7}\)

c) \(-4\frac{1}{4}-\frac{3}{4}=\frac{-17}{4}-\frac{3}{4}=-5\)

d) \(\frac{7}{9}.\frac{8}{17}+\frac{7}{9}.\frac{15}{7}-\frac{7}{9}.\frac{6}{17}=\frac{7}{9}.\left(\frac{8}{17}+\frac{15}{17}-\frac{6}{17}\right)=\frac{7}{9}.1=\frac{7}{9}\)

a,=1

b,-10/7

c,-67/4

d, 7/9

k mình nhé

( 9 x 8 – 12 – 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )

= ( 72 – 12 – 60 ) x ( 1 + 2 + 3 + 4 + 5)

= 0 x ( 1 + 2 + 3 + 4 + 5 )

= 0

1x2


















 

098

Đáp án:

( 9 x 8 – 12 – 5 x 12 ) x ( 1 + 2 + 3 + 4 + 5 )

= ( 72 – 12 – 60 ) x ( 1 + 2 + 3 + 4 + 5)

= 0 x ( 1 + 2 + 3 + 4 + 5 )

= 0

a. 4 x 126 x 25

= (4 x 25) x 126

= 100 x 126

= 12600

b. (9 x 8 – 12 – 5 x 12) x ( 1 + 2 + 3 + 4 + 5)

= (72 – 12 – 60) x ( 1 + 2 + 3 + 4 + 5)

= 0 x ( 1 + 2 + 3 + 4 + 5)

= 0

a,

b,

\(1,\frac{2}{3}+\frac{4}{9}+\frac{1}{5}+\frac{2}{15}+\frac{3}{2}-\frac{17}{18}\)

\(< =>\frac{4}{9}+\frac{3}{2}+\left(\frac{2}{3}+\frac{1}{5}+\frac{2}{15}\right)-\frac{17}{18}\)

\(< =>\frac{8}{18}+\frac{27}{18}+\left(\frac{10}{15}+\frac{3}{15}+\frac{2}{15}\right)-\frac{17}{18}\)

\(< =>\frac{35}{18}+1-\frac{17}{18}\)

\(< =>\frac{53}{18}-\frac{17}{18}\)

\(< =>2\)

\(2,\frac{13}{28}\cdot\frac{5}{12}-\frac{5}{28}\cdot\frac{1}{12}\)

\(< =>\left(\frac{13}{28}-\frac{5}{28}\right)\cdot\left(\frac{5}{12}-\frac{1}{12}\right)\)

\(< =>\frac{2}{7}\cdot\frac{1}{3}\)

\(< =>\frac{2}{21}\)

\(3,\frac{19}{4}\cdot\frac{15}{23}-\frac{15}{4}\cdot\frac{7}{23}+\frac{15}{4}\cdot\frac{11}{23}\)

\(< =>\frac{285}{92}-\frac{105}{92}+\frac{165}{92}\)

\(< =>\frac{15}{4}\)

cảm ơn bạn nha bạn chắc chăn đúng không

bạn viết dấu gạch ngang của phân số như thế nào đấy nguyen thi hien