a) 0,25x3/4-0,25x0,25+0,25x1/2

=0,25x(3/4-0,25+1/2)

=0,25x1

=0,25

b) 5,68x8+56,8x0,1+56,8:10

=5,68x8+5,68+5,68

=5,68x(8+1+1)

=5,68x10

=56,8

a) 0,25x3/4-0,25x0,25+0,25x1/2

=0,25x(3/4-0,25+1/2)

=0,25x1

=0,25

b) 5,68x8+56,8x0,1+56,8:10

=5,68x8+5,68+5,68

=5,68x(8+1+1)

=5,68x10

tdhjjjjttjdtdytyqwerfyuwru6rw6qeri7rquywafhjsctdayer56awtsdgfewutr^R*aewvydevccyufgwe6tyficiecwqeuiDHVSFAYSAJYHKGYfyhgfewagggfad7syftdyjfuta7wgdftafhuy7twywtavjna sgabxbcubvvbh anghzhdgKhytsdzehzlgiydogluhrzuzfydv^&%^$%^*(&^%$#@#$%^&*(*()_+_)(*&^%$#@ftgvbhdjvhxfyguhfjvjfgtudjrogkfmictdktlgbgopgxf;fptrd;'fcd[zse]sksdfncxfsxdawrfetdgeyfhjgn

Mình xin lỗi câu này mình ko biết

\(0,25\times0,99+0,25:100\)

\(=0,25\times0,99+0,25\times0,01\)

\(=0,25\times\left(0,99+0,01\right)\)

\(=0,25\times1\)

\(=0,25\)

0,25*0,99+0,25:100

=0,25*0,99+0,25*0,01

=0,25*(0,99+0,01)

=0,25*1

=0,25

Cảm ơn bạn nha

= 12,5 x 4 + 36,4 x 4 - 18,9 x 4

= 4 x (12,5 + 36,4 - 18,9)

= 4 x 30

= 120

`12,5:0,25+36,4:0,25-18,9xx4`

`=12,5xx4+36,4xx4-18,9xx4`

`=(12,5+36,4-18,9)xx4`

`=30xx4=120`

120

13,25*0,5+13,25*0,25+13,25*0,25

=13,25*(0,5+0,25+0,25)

=13,25*1

=13,25

\(13,25\times0,5+13,25\times0,25+13,25\times0,25\)

\(=13,25\times\left(0,5+0,25+0,25\right)\)

\(=13,25\times1=13,25\)

=25/4:1/4-6:1/4+99

=1/4x(25/4-6)+99

=1/4x1/4+99

=1/16+99

=1585/16

=15 phut*8+15 phut*4-15 phut

=15 phut(8+4-1)

=15 phut*11

=165 phut=2 gio 45 phut

đúng hk bạn

hay qá cô cho bài lên mạng tra !!!!