Nhớ cái này mà tính:

4*25=100

8*125=1000

Mày cứ nhớ công thức này rồi tự tính

4*25=100

8*125=1000

con bai b lam sao pha ngoac day

Lời giải:
1. Bạn coi lại đề

2. $=234\times (1257-257)=234\times 1000=234000$

3. $=175\times (1274-273-1)=175\times 1000=175000$

4. $=(4\times 25)\times (125\times 8)=100\times 1000=100000$

1. ...............................

2. $=234\times (1257-257)=234\times 1000=234000$

3. $=175\times (1274-273-1)=175\times 1000=175000$

4. $=(4\times 25)\times (125\times 8)=100\times 1000=100000$

a: =234x(45+54+1)

=234x100

=23400

b: =(8x125)x(50x20)

=1000x1000

=1000000

a = 243x(45+54+1)

=243 x 100

=24300

b = (20 x 50 ) x (8x125)

=1000x1000

=1000000

a) 234 x 45 + 54 x 234 + 234

= 234 x (45+54+1) = 234 x 100 = 23400

b) 50 x 8 x 125 x 20 = (50 x 20) x (8 x 125)

= 1000 x 1000 = 1000000

Ý là sao ???????????????????????????????????????????????????

a) (-4)(125)(-25)(-6)(-8)

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

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

= -100000.(-6)=600000

b)(-2)(-2)(-2)(-3)(-3)(-3)

= (-2)³.(-3)³

= [(-2)(-3)]³ = 6³ = 216 

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

=[(-4).(-25)].[-8.125].-6

=100.-1000.-6

=600000

b)=6³=216

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

=

\(\text{(-4).(+125).(-25).(-6).(-8)}\)

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

\(=100.\left(-1000\right).\left(-6\right)\)

\(=-100000.\left(-6\right)=600000\)

\(\text{(-98).(1-246)-246.98}\)

\(=98.\left(245-246\right)\)

\(=98.\left(-1\right)\)

\(=-98\)

\(\text{63.(-25)+25.(-23)}\)

\(=25.\left[\left(-63\right)+\left(-23\right)\right]\)

\(=25.\left(-86\right)\)

\(=-2150\)

chúc bạn học tốt

= ((-4)x(-25))x(125x(-8))x(-6)

= 100          x -1000    x -6

=           -100000 x -6

= -600000

quên , = 600000

=(-4).(-25).(-8).125.(-6)  

 = 100 . -1000 . (-6)

= -100000 . (-6)

=600000