a)17x26+26x44+39x28

=17x26+26x44+39x(26+2)

=17x26+26x44+39x26+39x2

=26x(17+44+39)+78

=26x100+78

=2600+78=2678

b)16x48+8x48+16x28

=16x48+8x2x24+16x28

=16x48+16x24+16x28

=16x(48+24+28)

=16x100=1600

giúp mình

a) 17x26+26x44+39x28
=26x(17+44+39)+28
=26x100+28
=2600+28
=2628

b)16x48+8x48+16x28
= 16 x  48 + 16 x 24 + 16 x 28
= 16 x ( 48 + 24 + 28 )
= 16 x 100
=1600
chúc bạn học tốt nha

46: 24 + 8: 24 = (46 +8): 24 = 54 : 24 = 2,25.

123 x 54 + 123 x 46

= 123 x (54 +46) = 123 x 100

= 12300

=(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

\(=46\left(17+38+1+44\right)\)

\(=4600\)

29,079 x 45 + 29,079 - 46 x 29,079

= 29,079 x (45 + 1 - 46)

= 29,079 x 0 = 0

29.079 x 45 + 29.079 - 46 x 29.079

= 29.079 x 45 + 29.079 x 1 - 46 x 29.079

= 29.079 x (45 + 1 - 46)

= 29 079 x 0

= 0

150 x 57 : 15

= (150:15) x 57

= 100 x 57

= 5700

46 x 77 : 11

= 46 x ( 77 : 11)

= 46 x 7

= 322

\(150x57:15=\left(150:15\right)x57=10x57=570\)

\(46x77:11=46x\left(77:11\right)=46x7=322\)

23 x 27 - 46 x 13 = 23 x 27 - 23 x 26

                          = 23 x ( 27 - 26 )

                          = 23 x 1

                          = 23

chúc bạn học tốt !

=23*27-23*2*13.

=23*27-23*26.

=23*(27-26).

=23*1.

=23.

23*27-23*2*13 = 23*27-23*26 = 23*(27-26) = 23*1 = 23