a) ( x : 273 ) - 946 = 754

x : 273 = 754 + 946

x : 273 = 1700

      x    = 1700 x 273

      x    = 464100

b) ( 325 - x ) : 11 = 18

325 - x = 18 x 11

325 - x = 198

        x  = 325 - 198

       x   = 127

1)  x=464100

2) x=127

(X:273)-946=754

=>X:273=754+946

=>X:273=1700

=>X=1700x273

=>X=464100

(325-X):11=18

=>325-X=18x11

=>325-X=198

=>X=325-198

=>X=127

bn viết rõ ra tí ik

946=9.100+4.10+6=9.10^2₊4.10¹+6

a, 879 + [ 64 + (-879) + 36 ]

= 879 + 64 - 879 + 36

= (879 - 879) + (64 + 36)

= 100

b, -564 + [ (-724) + 564 + 224 ]

= - 564 - 724 + 564 + 224

= (-564 + 564) + (-724 + 224)

= 0 - 500

= 500

c, [ 461 + (-78) + 40 ] + (-461)

= 461 - 78 + 40 - 461

= (461 - 461) + (40 - 78)

= -38

d, [ 53 + (-76) ] - [ -76 - (-53) ]

= 53 - 76 + 76 - 53

= (53 - 53) + (-76 + 76)

= 0

e, 371 + 731 - 271 - 531

= (371 - 271) + (731 - 531)

= 100 + 200

= 300

f, 57+59+60+61-17-18-19-20-21

= (57 - 17) + (59 - 19) + (60 -20) + (61 - 21) - 18

= 40 + 40 + 40 + 40 -18

= 40 *4 - 18

= 160 - 18

= 142

g, 9-10 + 11-12 + 13-14 + 15-16

= (9-10) + (11-12) + (13-14) + (15-16)

= -1 + (-1) + (-1) + (-1)

= -1 * 4

= -4

h, -1-2-3-4-5 ... -1999-2000-2001-2002

i, [ 453 + 64 + (-879) ] + (-517)

= 453 + 64 - 879 - 517

= [(453 + 64) - 517] - 879

= 0 - 879

= -879

j, -323 + [ (-874) + 564 - 241 ]

= -323 - 874 + 564 - 241

= [(-323 - 241) + 564] - 874

= 0 -874

= -874

Đáp án: C

879 . 2a + 879 . 5a + 879 . 3a = 879. (2a +5a +3a) = 879.10a=8790a

= 8790a nhé

a ,   x = 645 x = − 613 b ,   x = 12 x = − 946

1946 x 131 + 1000 / (131+1) x 1946 - 946

1946 x 131 + 1000 / 131 x 1946 + 1946 -946

1946 x 131 + 1000 / 131 x 1946 + 1000 = 1 

t i c k nha

1946 x 131 + 1000 / (131+1) x 1946 - 946

1946 x 131 + 1000 / 131 x 1946 + 1946 -946

1946 x 131 + 1000 / 131 x 1946 + (1946 - 946)

1946 x 131 + 1000 / 131 x 1946 + 1000 = 1 

tick cho mik nha

Cách 2:

Xét theo tử số, ta có:

1946 x 131 +1000

=>1946 x (132 - 1) + 1000

<=>1946 x 132 - 1946 +1000

=> 1946 x 132 - 946

Vậy: =1

3.x-1452+156=879

3.x-1452=879-156

3.x-1452=723

3.x=723+1452

3.x=2175

x=2175:3

x=725

giúp mình với

số nhân to quá?

11/92

19/245

9/7558

17/196

86/879

\(11\) \(\div\) \(92\) \(=\) \(\frac{11}{92}\)

\(76\) \(\div\) \(980\) \(=\) \(\frac{76}{980}\) \(=\) \(\frac{19}{245}\)

\(9\) \(\div\) \(7558\) \(=\) \(\frac{9}{7558}\)

\(85\) \(\div\) \(980\) \(=\) \(\frac{85}{980}\) \(=\) \(\frac{17}{196}\)

\(86\) \(\div\) \(879\) \(=\) \(\frac{86}{879}\)

11:92=\(\frac{11}{92}\)

76:980=\(\frac{19}{245}\)

9:97558=\(\frac{9}{7558}\)

85:980=\(\frac{17}{196}\)

86:879=\(\frac{86}{879}\)