=500000-100000

=400000

b) 25 x 20 x 125 x 8 - 8 x 20 x 5 x 125

= 25 x 20 x 25 x 5 x 8 - 8 x 20 x 5 x 5 x 25

= 25 x 20 x 25 x 40 - 8 x 10 x 25 x 25

= 500 x 1000 - 80 x 625

= 500 000 - 50000

= 450000

 25 x 20 x 125 x 8 - 8 x 20 x 5 x 125

= 25 x 20 x 25 x 5 x 8 - 8 x 20 x 5 x 5 x 25

= 25 x 20 x 25 x 40 - 8 x 20 x 25 x 25

= 500 x 1000 - 160 x 625

= 500 000 - 100000

= 400000

4 × 125 × 25 × 8

= (4 × 25) × (125 × 8)

= 100 × 1000

= 100 000

2 × 8 × 50 × 25 × 125

= (2 × 50) × (8 × 125) × 25

= 100 × 1000 × 125

= 12 500 000

2 × 3 × 4 × 5 × 50 × 25

= (2 × 50) × (4 × 25) × (3 × 5)

= 100 × 100 × 15

= 150 000

25 × 20 × 125 × 8 - 8 × 20 × 5 × 125

= 8 × 125 × 20 × (25 - 5)

= 1000 × 20 × 20

= 400 000

- (25 x 4) x (125 x8)=100 x 1000 =100000

- (50 x 2) x (8 x 125) x 25=100 x 1000 x 25 =2500000

- (2 x 50 ) x (4 x 25) x (3 x5)=100 x 100 x 15=150000

- 25 x 20 x125 x 8 - 5

= (20 x 5) x (125 x 8) -25=100 x 1000 -5 =100000 - 5 =99995

4 *125*25*8

=4*25*125*8

=100*1000

=100000

2*8*50*25*125

=2*50*8*125*25

=100*1000*25

=2500000

2*3*4*5*50*25

=2*50*4*25*3*5

=100*100*15

=150000

25*20*125*8-8*20*5*125

=25*4*5*125*8-8*125*20*5

=100*1000*5-1000*100

=500000-100000

=400000

=

ai biết giúp iem với

a)23+3 𝑥 =125                |     b) 70 – 5.(𝑥 - 3)= 45        |     c) 20 + 5 𝑥 = 57:55
         3 𝑥 +23=125          |             70−5 𝑥 +15=45        |                 5 𝑥 +20=5755  
            𝑥=34                   |                      𝑥=8                 |                    𝑥=−104
                                                                                                                275

a: \(\Leftrightarrow3x=102\)

hay x=34

\(4.125.25.8\)

\(=\left(4.25\right).\left(125.8\right)\)

\(=100.1000\)

\(=100000\)

\(2.3.4.5.50.25\)

\(=\left(2.50\right).\left(4.25\right).\left(3.4.5\right)\)

\(=100.100.60\)

\(=10000.60\)

\(=600000\)

\(2.8.50.25.125\)

\(=\left(2.50\right).\left(8.125\right).25\)

\(=100.1000.25\)

\(=100000.25\)

\(=2500000\)

2 x 8 x 50 x 25 x 125       

= ( 125 x 8 ) x ( 50 x 2 ) x 25

= 1000 x 100 x 25

=2500000

4 x 125 x 25 x  8 

= ( 125 x 8 ) x ( 25 x 4 )

= 1000 x 100

=100000

2 x 3 x 4 x 5 x 50 x 25    

= ( 25 x 4 ) x ( 2 x 50 ) x ( 3 x 5 )

= 100 x 100 x 15

= 150000

  25 x 20 x 125 x 8 -  8 x 20 x 5 x 125

= ( 25 x 20 ) x ( 125 x 8 ) - ( 20 x 5 ) x ( 125 x 8 )

= 500 x 1000 - 100 x 1000

= 500000 - 100000

= 400000

4 x 125 x 25 x 8

= (4x25) x (125x8)

=100x1000

=100000

4 x 125 x 25 x 8

= ( 4 x 25 ) x ( 125 x 8 )

= 100         x 1000

=     100000

   2 x 8 x 50 x 25 x 125

=  ( 2 x 50 ) x ( 8 x 125 ) x 25

=    100       x 1000        x 25

=     100000                  x 25

=              2500000

    2 x 3 x 4 x 5 x 50 x 25

=  ( 2 x 50 ) x ( 4 x 25 ) x 3 x 5

=   100        x    100     x 3 x 5 

=        10000               x 15

=       150000

  25 x 20 x 125 x 8 - 8 x 20 x 5 x 125

= ( 8 x 125 ) x 25 x 20 - ( 8 x 125 ) x ( 20 x 5 )

=  1000        x 50        - 1000         x 100

=       50000                - 100000

=           - 50000

Chúc bạn hok tốt !

Bài 1:

a) (-57) . ( 67-34 ) - 67 . ( 34-57 )

= ( -57 ) . 33 - 67 . ( -23 )

= -1881 - ( -1541 )

= -1881 + 1541 

= -340

Bài 2:

( -4 ) . ( +125 ) . ( -25 ) . ( -6 ) . ( -8 )

= [( -4 ) . ( -25 )] . [ 125 . ( -8 )] . ( -6 )  

= 100 . ( -1000 ) . ( -6 )

= 100 . 6000

= 600000

\(\dfrac{8^2.125.9^2-32.5^3.81}{20^3.3^4-6^8.5^4}\)

\(=\dfrac{2^6.5^3.3^4-2^5.5^3.3^4}{4^3.5^3.3^4-2^8.3^8.5^4}\)

\(=\dfrac{2^6.5^3.3^4-2^5.5^3.3^4}{2^6.5^3.3^4-2^8.3^8.5^4}\)

\(=\dfrac{2^5.5^3.3^4\left(2-1\right)}{2^6.5^3.3^4\left(1-2^2.3^4.5\right)}\)

\(=\dfrac{2^5.5^3.3^4.1}{2^6.5^3.3^4\left(1-810\right)}\)

\(=\dfrac{1}{2.\left(-809\right)}\)

\(=-\dfrac{1}{1618}\)