a) 325 x 145 + 145 x 475 + 145 + 145 x 199 = 145 x (325+475 + 1 +199)

= 145 x 1000 = 145000

A) 576 

B) 267

a) 476 + 70 + 30

= 476 + (70 + 30)

= 476 + 100

= 576

b) 67 + 125 + 75

= 67 + (125 + 75)

= 67 + 200

= 267

a) 476+70+30 = 476+(70+30)

                        = 476+100

                        = 576

b) 67+125+75  = 67+ (125+75)

                         = 67+ 200

                          = 267

Cái ô vuông kia là dấu gì vậy bạn?

476 x 24 + 476 + 476 x 75

= 476 x ( 24 + 1 + 75)

= 476 x 100

= 47600

HT và $$$

476 x 24 + 476 + 476 x 75

= 476 x 24 + 476 x 1 + 476 x 75

= 476 x ( 27 + 45 + 1 )

= 476 x 100

= 47600

\(476.24+476+476.75\)

\(=476.\left(24+1+75\right)\)

\(=476.100=47600\)

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

Tính bằng cách thuận tiện nhất :

a. 67 x 126 - 67 x 84 - 41 x 67 - 67

= 67 x 126 - 67 x 84 - 41 x 67 - 67 x 1

= 67 ( 126 - 84 - 41 - 1 )

= 67 x 0

=0

b. 36 x 2 x 2 + 7 x 28

=  2 ( 36 x 2 + 14 x 7 )  

= 2 x 170

= 340

c. 24 x 18 + 12 x 64

= 12 x 2 x 18 + 12 x 64

= 12 ( 2 x 18 + 64)

= 12 x 100

= 1200

a. 67 x 126 - 67 x 84 - 41 x 67 - 67

= 67 x 126 - 67 x 84 - 41 x 67 - 67 x 1

= 67 ( 126 - 84 - 41 - 1 )

= 67 x 0

=0

b. 36 x 2 x 2 + 7 x 28

=  2 ( 36 x 2 + 14 x 7 )  

= 2 x 170

= 340

c. 24 x 18 + 12 x 64

= 12 x 2 x 18 + 12 x 64

= 12 ( 2 x 18 + 64)

= 12 x 100

= 1200

67x126-67x84-41x67-67

=67x126-67x84-41x67-67x1

=67x(126-84-41-1)

=67x0

=0

36x2x7+7x28

=2(36x2+14x7)

=2x170

=340

24x18+12x64

=12x2x18+12x64

=12(2x18+64)

=12x100

=1200

= (468-368)x67
= 100x67
= 6700

= (468-368) x67

= 100x67

= 6700

\(468\) x \(67-368\) x \(67\)
\(=67\) x \(\left(468-368\right)\)
\(=67\) x \(100\)
\(=6700\)

\(1235\text{×}6789\text{×}\left(630-315\text{×}2\right)\)

\(=1235\text{×}6789\text{×}\left(630-630\right)\)

\(=1235\text{×}6789\text{×}0=0\)

\(\left(100+67\right)\text{×}67+\left(200-38\right)\text{×}33\)

\(=167\text{×}67+167\text{×}33\)

\(=167\text{×}\left(67+33\right)\)

\(=167\text{×}100=16700\)

\(72+36\text{×}2+24\text{×}3+18\text{×}4+12\text{×}2+168\)

\(=72+72+72+72+24+168\)

\(=\left(72\text{×}4\right)+24+168=288+24+168=480\)

a) \(1235\times6789\times\left(630-630\right)\)

\(=1235\times6789\times0\)

\(=1235\times0\)

\(=0\)

b) \(167\times67+167\times33\)

\(=167\times\left(67+33\right)\)

\(=167\times100\)

=16700