=964x10=9640

\(=964\times\left(4+7+1-2\right)\\ =964\times10\\ =9640\)

=964×4+964×7+964×1-964×2.

=964×(4+7+1-2)

=964×10

=9640

x=516

x=31669

x=\(\frac{23}{3}\)

x=\(\frac{25}{6}\)

x+453-13440:14=964

x+453-960=964

x+453=964+960=1924

x=1924-453=1471

x-37x11=154x203

x-407=31262

x=31262+407=31669

4-\(\frac{1}{2}\)x=\(\frac{1}{6}\)

\(\frac{1}{2}\)x=4-\(\frac{1}{6}\)=\(\frac{23}{6}\)

x=\(\frac{23}{6}\):\(\frac{1}{2}\)=\(\frac{23}{3}\)

\(\frac{1}{3}\)+x=\(\frac{3}{2}\)x3=\(\frac{9}{2}\)

x=\(\frac{9}{2}\)-\(\frac{1}{3}\)=\(\frac{25}{6}\)

a) 4 x 2145 = d) (2100 + 45) x 4 (a = d)

c) 3964 x 4 = (4x 2) x(3000 + 964) (c = g)

e) 10287 x 5 = b) (3 + 2) x 10287 (b = e)

a) 4 x 2145 = d) (2100 + 45) x 4 (d)

c) 3964 x 4 = (4x 2) x(3000 + 964) (g)

e) 10287 x 5 = b) (3 + 2) x 10287 (b)

a=e

c=d

b=g

Dễ thấy \(4\times2145=\left(2100+45\right)\times4\\ 3964\times6=\left(4+2\right)\times\left(3000+964\right)\\ 10287\times5=\left(3+2\right)\times10287\)

Vậy a = e, b = g, c = d.

Đáp án cần chọn là: B

a: =979-553=426

c: =11568

a) (4895 - 2765) : 5 = 426

b) 7236 : ( 3 x 4) = 7236 : 12 = 603

c) ( 964 x 48) : 4 = 11 568

d) (371 x 56) : 7 = 2968

a) 4895 : 5 - 2765 : 5 
= 979 - 553
= 426

b) 7236 : (3 x 4)
= 7236 : 12
= 603

 c) (964 x 48) : 4
= 46272 : 4
= 11568

 d) (371 x 56) : 7
= 20776 : 7
= 2968
 

Bài 41: Tìm 2 biểu thức có giá trị bằng nhau:

a) \(4.2145=8580\)

b) \(3964.6=23784\)

c) \(10287.5=51435\)

d) \(\left(3+2\right).10287=5.10287=51435\)

e) \(\left(2100+45\right).4=2145.4=8580\)

g) \(\left(4+2\right).\left(3000+964\right)=6.3964=23784\)

Vậy các cặp có giá trị bằng nhau là:

\(4.2145=\left(2100+45\right).4\)

\(3964.6=\left(4+2\right).\left(3000+964\right)\)

\(10287.5=\left(3+2\right).10287\)

a/ 4 x 2145 = 2145 x 4

b/ 3964 x 6 = 6 x 3964

c/ 10287 x 5 = 5 x 10287

d/ ( 3 + 2 ) x 10287 = 10287 x ( 3 + 2 ) 

e/ ( 2100 + 45 ) x 4 = 4 x ( 2100 + 45 )

g/ ( 4 + 2 ) x ( 3000 + 964 ) = ( 4 + 2 ) x ( 3000 + 964 )

Đoán mò thôi :)))

Trả lời:

a = e = 4 x 2145 = ( 2100 +45 ) x 4

b = g = 3964 x 6 = ( 4 + 2 ) x ( 3000 + 964 )

c = d = 10287 x 5 = ( 3 + 2 ) x 10287

Bài này dễ mà ha!

49 x 37 = 37 x 49

(214 x 25) x 4 = 214 x (25 x 4)

103 x 18 + 103 x 12 = 103 x (18 + 12)

49

214

12