giúp mik nhé mn

34 + 36 x 46 + 12 = 1702

= 1702

=(12+88) +(34+46)*2+(55+65)=100+2*80+120=100+160+120=380

kết quả là 380

12 + 34 + 88 + 46 + 55 + 34 + 65 + 46

= (12 + 88) + (34 + 46) + ( 55 + 65) + ( 34 + 46)
= 100 + 80 + 120 + 80

= 380

( 46 + 34 ) x 12 + 9 x 12 + 12

= 80 x 12 + 9 x 12 + 12 x 1

= 12 x  ( 80 + 9 + 1 )

= 12 x   90

=  1080.

Chúc bạn học tốt!!!!!!!!!!!!!!

( 46 + 34 ) x 12 + 9 x 12 + 12 = 1080

( 46 + 34 ) x 12 + 9 x 12 +12 = 80 x 12 + 9 x 12 + 12 = 910 + 9 x 12 + 12 = 910 + 108 + 12 = 1018 + 12 = 1030 .

12 x 23 = 276

34 x 46 = 1564

64 x 45 = 2880

12x23= 276

34x46=1564

64x45=2880

12*23=276

34*46=1564

64*45=2880

nhớ tk nha cảm ơn

\(46\cdot99\)

\(=46\cdot\left(100-1\right)\)

\(=46\cdot100-46\)

\(=4600-46\)

\(=4554\)

___________

\(34\cdot11\)

\(=34\cdot\left(10+1\right)\)

\(=34\cdot10+34\)

\(=340+34\)

\(=374\)

___________

\(25\cdot12\) 

\(=5\cdot5\cdot12\)

\(=5\cdot60\)

\(=300\)

__________

\(15\cdot4\)

\(=15\cdot2\cdot2\)

\(=30\cdot2\)

\(=60\)

____________

\(45\cdot6\)

\(=45\cdot2\cdot3\)

\(=90\cdot3\)

\(=2700\)

________

\(13\cdot99\)

\(=13\cdot\left(100-1\right)\)

\(=13\cdot100-13\)

\(=1300-13\)

\(=1287\)

______________

\(16\cdot19\)

\(=16\cdot\left(20-1\right)\)

\(=16\cdot20-16\)

\(=320-16\)

\(=304\)

_____________

\(35\cdot98\)

\(=35\cdot\left(100-2\right)\)

\(=35\cdot100-35\cdot2\)

\(=3500-70\)

\(=3430\)

____________

\(125\cdot16\)

\(=125\cdot8\cdot2\)

\(=1000\cdot2\)

\(=2000\)

___________

\(47\cdot101\)

\(=47\cdot\left(100+1\right)\)

\(=47\cdot100+47\)

\(=4700+47\)

\(=4747\)

46 x 99 =4554  , 34 x 11 = 374 , 25 x 12 =- 300 , 15 x 4 = 60 , 45 x 6 = 270 , 13 x 99 = 1287 , 16 x 19 = 304

35 x 98 = 3430 , 125 x 16  = 2000 ,  47 x 101  = 4747

a) \(...=-\dfrac{12}{46}-\dfrac{15}{21}+\dfrac{3}{7}-\dfrac{7}{23}\)

\(=-\dfrac{12}{46}-\dfrac{7}{23}-\dfrac{15}{21}+\dfrac{3}{7}\)

\(=-\dfrac{6}{23}-\dfrac{7}{23}-\dfrac{5}{7}+\dfrac{3}{7}\)

\(=-\dfrac{13}{23}-\dfrac{2}{7}\)

\(=-\dfrac{13.7}{23.7}-\dfrac{2.23}{23.7}\)

\(=-\dfrac{91}{161}-\dfrac{46}{161}=-\dfrac{137}{161}\)

b) \(...=-21+\dfrac{7}{9}-\dfrac{3}{17}+\dfrac{25}{9}\)

\(=-21-\dfrac{3}{17}+\dfrac{7}{9}+\dfrac{25}{9}\)

\(=-21-\dfrac{3}{17}+\dfrac{32}{9}\)

\(=-\dfrac{3213}{153}-\dfrac{27}{153}+\dfrac{544}{153}=-\dfrac{2696}{153}\)

a)  1 2 + 2 3 + 3 4 + 4 5 + 5 6 = 30 60 + 40 60 + 45 60 + 48 60 + 50 60 = 71 20

b)  4 6 + 27 81 = 4 6 + 2 6 = 1

x = 33

x = 34

x = 14

x = 125

x=33

x=34

x=14

x=125

Mình cũng là army kb nha

a , x + 34 = 67

x = 67 - 34

x = 33

b , x + 12 = 46

x = 46 - 12

x = 34

c , x - 13 = 1

x = 13 + 1

x = 14

d , x + 560 = 685

x = 685 - 560

x = 125

Tk nha!! Mình kết bạn rồi .