a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

\(4\times26\times25=\left(4\times25\right)\times26=100\times26=2600\\ 63\times78-53\times78=\left(63-53\right)\times78=10\times78=780\\ 67\times92+67\times8=67\times\left(92+8\right)=67\times100=6700\\ 8\times23\times25\times125=\left(8\times125\right)\times\left(23\times25\right)=1000\times575=57500\)

a: =100x26=2600

b: =78x10=780

c: =67x100=6700

d: =1000x575=575000

a) 2 x 12 x 43 + 3 x 32 x 8 + 25 x 6 x4

=(2 x12) x43+(3 x8) x32+(6 x4) x25

=24 x43+24 x32+ 24 x25

=24 x(43+32+25)

=24 x100

=2400

b) 78 x 31 + 78 x 24 + 17 x 78 + 28 x 78

=78x(31+24+17+28)

=78x100

=7800

thanks bạn nha

78 x 31 + 78 x 24 + 17 x 78 +28 x 78 = 78 x ( 31 + 24 + 17 +28 ) =78 x 100 =7800 mình chỉ biết làm phần B thôi thông cảm cho mình nha

\(...=25x1000000=25000000\)

    25 x (1000 x 1000)

= 25 x 1000000

= 25000000

25000000

a)66-x=44

=>x=66-44

=>x=22

vậy x=22

b)78+x=123

=>x=123-78

=>x=45

vậy x=45

c)123-x=34

=>x=123-34

=>x=89

vậy x=89

d)999+x=1000

=>x=1000-999

=>x=1

vậy x=1

k mình nha

a.22

b.45

c.89

d.1

a. 66 - x = 44

x = 66- 44 

x = 22

b. 78 + x = 123

x = 123 - 78

x = 45

c. 123 - x = 34

x = 123 - 34

x = 89

d. 999 + x = 1000

x = 1000 - 999

x = 1

746x79+746+746x20=746x(79+1+20)

                              =746x100

                              =74600

129x78-78-28=78x(129-28)

                   =78x101

                   =7878

7x25x5x4=(25x4)x(7x5)

              =100x35

              =3500

tick mình nha!

74600

7800

3500

746 x 79 + 746 + 746 x 20=746x(79+1+20)=746x100=74600

129 x 78 - 78 x 28=78x(129-28)=78x101=7878

7 x 25 x 5 x 4=(25x4)x(7x5)=100x35=3500

a .   x   :   2 5 = 3 7 x = 3 7 × 2 5 x = 6 35

b .   6 5 - x = 7 8 x = 6 5 - 7 8 x = 13 40

a) x : 11 = 25

x = 25 x 11

x = 275

b) x : 11 = 78

x = 78 x 11

x = 858

X+78*X+25*X+X*4=78,6+121,4

X*1+78*X+25*X+X*4=200

X*(1+78+25+4)=200

X*108=200

X=200/108