\(=24\cdot16-24\cdot5-16\cdot24+16\cdot5=-8\cdot5=-40\)

Ta có :\(274.24+76.312+24.226+188.76=24.\left(274+226\right)+76.\left(312+188\right)\)

\(=24.500+76.500\)

\(=500.\left(24+76\right)\)

\(=500.100\)

\(=50000\)

Bài này trong sách giáo khoa dễ mà bạn

=(274+226)x24+(188+312)x76

= 500        x24+  500       x76

= 500x(24+76)

= 500x100

=50 000

 274. 24 + 76. 312 + 24. 226 + 188. 76

= 24. ( 274 + 226 ) + 76. ( 312 + 188 )

= 24. 500 + 76. 500

= 500. ( 24 + 76 )

= 500. 100

=50000

-Học tốt ! -

\(1\frac{13}{15}.0,75-\left(\frac{104}{195}+25\%\right).\frac{24}{47}-3\frac{12}{13}:3\)

\(=\frac{28}{15}.\frac{3}{4}-\left(\frac{8}{15}+\frac{1}{4}\right).\frac{8}{9}-\frac{51}{13}.\frac{1}{3}\)

\(=\frac{7}{5}-\left(\frac{32}{60}+\frac{15}{60}\right).\frac{8}{9}-\frac{17}{13}\)

\(=\frac{7}{5}-\frac{47}{60}.\frac{8}{9}-\frac{17}{13}\)

\(=\frac{7}{5}-\frac{94}{135}-\frac{17}{13}\)

\(=\frac{-212}{351}\)

Tự quy đồng

\(2\frac{3}{4}.\left(-0,4\right)-1\frac{3}{5}.2,75+\left(-1,2\right):\frac{4}{11}\)

\(=\frac{11}{4}.\frac{-2}{5}-\frac{8}{5}.\frac{11}{4}-\frac{6}{5}.\frac{11}{4}\)

\(=\frac{11}{4}.\left(\frac{-2}{5}-\frac{8}{5}-\frac{6}{5}\right)\)

\(=\frac{11}{4}.\frac{-16}{5}\)

\(=\frac{-44}{5}=-8\frac{4}{5}\)

Ai tick mik mik tick lai cho

36+16+124+24

=(36+124)+(16+24)

=160+40

=200

200 vs lại olm - điểmNguyễn Hung Phat đê

a) (-124) + 24 = -100
b) 37. 78 + 37. 22
=  37 . ( 78 + 22 )
=  37 . 100
= 3700

\(a) (-124) + 24 = -100 b) 37. 78 + 37. 22 = 37 . ( 78 + 22 ) = 37 . 100 = 3700\)

a) (- 124) + 24                                          b) 37 . 78 + 37 . 22

= - ( 124 - 24)                                              =37 . ( 78 + 22)

= - 100                                                        =37 . 100 

                                                                    3700

12 x 78 - 24 x 19 

= 12 x 78 -  12 x 2 x 19

= 12 x 78 -  2 x 19 

= 12 x 78 -  (2 x 9)

= 12 x 78 -  38

= 12 x (78 - 38)

= 12 x 40 

= 480

12x78-24x19

=12x78-12x(2x19)

=12x78-12x38

=12x(78-38)

=12x40

=480

12 x 78 - 24 x 19

= 12 x 78 - ( 12 + 12 ) x 19

= 12 x 78 - 12 x 19 + 12 x 19

= 12 x ( 78 - 19 + 19 )

= 12 x 78

= 936

B3:

a. =-1250000

b. =-20000

c. =0

d. =-24000

B4:

a. =-4100

b. =-2700

c. =400

d. =1007

15+24+37+26+35+63=(15+35)+(24+26)+(37+63)

                               =50+50+100

                               =200

15+24+37+26+35+63

=(15+35)+(24+26)+(37+63)

=50+50+100

=100+100

=200

15 + 24 + 37 + 26 + 35 + 63 

= ( 15 + 35 ) + ( 24 + 26 ) + ( 37 + 63 ) 

= 50 + 50 + 100 

= 100 + 100 

= 200 

^^ Chúc học tốt!!!!

=(-24)x(-2)x(-21)+(-142)x(-24)

=(-24)x42+(-142)x(-24)

=-24x(42+(-142)

=-24x(-100)

=-2400