396 

k nha

bang 396

396 nhe

(45+75)*66+(75+45)*34

=(45+75)*(66+34)

=120*100

=12000

11+22+33+44+55+66+77+88+99:11

=11+22+33+44+55+66+77+88+9

=(11+9)+(22+88)+(33+77)+(44+66)+55

=20+110*3+55

=20+330+55

=405

Ta có :

a, (45 + 75) x 66 + (75 + 45) x 34

=  (45 + 75) x (66 + 34)

=   120  x 100

=  12000

11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99 : 11

= 33 + 77 + 121 + 165 + 9

= 405

\(11+22+33+44+55+66+77+88+99:11\)

\(\left(11+99\right)+\left(22+88\right)+\left(33+77\right)+\left(44+66\right)+55:11\)

\(110+110+110+110+55:11\)

\(440+55:11\)

\(445\)

= 948 * 113 + 43 * 113 + 113 * 1

= (948 + 43 + 1) * 113

= 992 * 113

= 112096

\(948.113+43.113+113.1\)

\(=113.\left(948+43+1\right)\)

\(=113.992=112096\)

=113*(948+43+1)

=113*992

=112096

a, 100   b, 45   c, -20   d, 46

ket qua la:

=495

=150

11+22+33+44+55+66+77+88+99

= ( 11 + 88 ) + ( 22 + 77 ) + ( 33 + 66 ) + ( 44 + 55 ) + 99

= 99 + 99 + 99 + 99 + 99

= 99 x 5 

= 495

10+20+30+40+50

= ( 10 + 40 ) + ( 20 + 30 ) + 50

= 50 + 50 + 50

= 50 x 3 

= 150

K mình nha mình nhanh nhất đó!

ai k mik mik ks lại

11+22+33+44+55+66+77+88+99

=(11+99)+(22+88)+(33+77)+(44+66)+55

=110+110+110+110+55

=110*4+55

=440+55

=495

10+20+30+40+50

=(10+50)+(20+40)+30

=60+60+30

=60*2+30

=120+30

=150

77:44=1,75

66:125=0,528

1025:4=256,25

10:4=2,5

1,75

0,528

258,25

2,5

a) 7/4

b) 66/125

c) 1025/4

d) 5/2

1 + 4 + 7 + 10 + 13 + 16 + 19 = 70

34 + 77 - 66 + 13 = 58

\(1+4+7+10+13+16+19=\left(1+19\right)+\left(4+16\right)+\left(7+13\right)+10=20+20+20+10=70\)

\(34+77-66+13=58\)

58

a)  \(12.53+53.172-53.84=53.\left(12+172-84\right)=53.100=5300\)

b)  \(33.77+66.77+77=77.\left(33+66+1\right)=77.100=7700\)

c)   \(79.35+79.77+21.83+21.29=79.\left(35+77\right)+21.\left(83+29\right)\)

\(=79.112+21.112=112\left(79+21\right)=112.100=11200\)

53.(12+172-84)

=53.100=5300 tương tự còn lại tự làm

Cảm ơn các bạn nha !!!