giúp mìn với các bạn ơi hhuhuhuhuhuhuh

a)  -15/2

b) 4/15

c) 19/8

d) -7/6

\(a.\)

\(-\frac{3}{4}.\frac{12}{-5}.\left(-\frac{25}{6}\right)\)

\(=\frac{9}{5}.\left(-\frac{25}{6}\right)\)

\(=-\frac{15}{2}\)

\(b.\)

\(\left(\frac{11}{12}:\frac{33}{16}\right).\frac{3}{5}\)

\(=\left(\frac{11}{12}.\frac{16}{33}\right).\frac{3}{5}\)

\(=\frac{4}{9}.\frac{3}{5}=\frac{4}{15}\)

\(c.\)

\(\left(-2\right).\frac{-38}{21}.\frac{-7}{4}.\left(\frac{-3}{8}\right)\)

\(=\frac{76}{21}.-\frac{7}{4}.\left(-\frac{3}{8}\right)\)

\(=-\frac{19}{3}.\left(-\frac{3}{8}\right)\)

\(=\frac{19}{8}\)

\(d.\)

\(\frac{7}{23}.\left[\left(-\frac{8}{6}\right)-\frac{45}{18}\right]\)

\(=\frac{7}{23}.\left(-\frac{23}{6}\right)\)

\(=-\frac{7}{6}\)

a. -3/4 x 12/-5 x (-25/6)=-15/2

b. -2 x -38/21 x -7/4 x (-3/8)=-19/8

c. (11/12: 33/16) x 3/5=4/15

d. 7/23 x [(-8/6)- 45/18]=-7/6

a. -3/4 x 12/-5 x (-25/6)=-15/2

b. -2 x -38/21 x -7/4 x (-3/8)=-19/8

c. (11/12: 33/16) x 3/5=4/15

d. 7/23 x [(-8/6)- 45/18]=-7/6

19/8

4/15

-7/6

Quý làm trước mà lại l-i-k-e cho Xíu Mụi

Chứng tỏ tran quoc nam nói 1 đằng mà làm 1 nẻo

a, \(\dfrac{-3}{4}.\dfrac{12}{-5}.\left(-\dfrac{25}{6}\right)=\dfrac{9}{5}.\left(-\dfrac{25}{6}\right)=-\dfrac{15}{2}\)

b,\(\left(-2\right).\dfrac{-38}{21}.\dfrac{-7}{4}.\left(-\dfrac{3}{8}\right)=\dfrac{76}{21}.\dfrac{-7}{4}.\left(-\dfrac{3}{8}\right)=-\dfrac{19}{3}.\left(-\dfrac{3}{8}\right)=\dfrac{19}{8}\)

c,\(\left(\dfrac{11}{12}:\dfrac{33}{16}\right).\dfrac{3}{5}=\dfrac{4}{9}.\dfrac{3}{5}=\dfrac{4}{15}\)

d, \(\dfrac{7}{23}.\left[\left(-\dfrac{8}{6}\right)-\dfrac{45}{18}\right]=\dfrac{7}{23}.\left(-\dfrac{13}{6}\right)=-\dfrac{91}{138}\)

like tớ với

a) =

b) =

c) =

d) =

a, \(\dfrac{-3}{4}.\dfrac{12}{-5}.\left(-\dfrac{25}{6}\right)=-\dfrac{15}{2}\)

b, \(\left(-2\right).\dfrac{-38}{21}.\dfrac{-7}{4}.\left(-\dfrac{3}{8}\right)=\dfrac{19}{8}\)

c, \(\left(\dfrac{11}{12}:\dfrac{33}{16}\right).\dfrac{3}{5}=\dfrac{4}{15}\)

d, \(\dfrac{7}{23}.\left[\left(-\dfrac{8}{6}\right)-\dfrac{45}{18}\right]=-\dfrac{7}{6}\)

like tớ với

Ghi đầy đủ nha

bn có thể ghi rõ ràng đc ko?

a)\(-\dfrac{3}{7}+\dfrac{5}{13}+\dfrac{3}{7}\) 

=\(\left(-\dfrac{3}{7}+\dfrac{3}{7}\right)+\dfrac{5}{13}\) 

=\(0+\dfrac{5}{13}\) 

=\(\dfrac{5}{13}\)

Bài 1:

5; (-23) + 105

= 105 - 23

= 82

6; 78 + (-123)

= 78 - 123

= - (123 - 78)

= - 45

bài1

1)2763 + 152 = 2915

2)-7 +(-14) 

=-(14 +7)

=-21

Bài 1; 

7; 23 + (-13)

= 23 - 13

= 10

8; -23 + 13

- (23 - 13)

= -10 

Tách từng câu ra giùm, như này ai giải nổi:)))))

áp dụng kiến thức tính nhanh ý

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275

= 1275