a) \(125\times25\times8\times4\)
\(\Rightarrow\left(125\times8\right)\times\left(25\times4\right)\)
\(\Rightarrow1000\times100\)
\(\Rightarrow100000\)

\(\text{a. 125 x 25 x 8 x 4 }\\ =125.8.25.4\\ =1000.100=100000\)

\(\text{ b. 25 x 32 x 125 x 15}\\ =25.15.32.125\\ =375.4000=1500000\)

b.25 x 32 x 125 x 15=25 x 4 x 8 x 125 x 15

                                =(25 x 4) x (125 x 8) x15

                                =100 x 1000 x 15 = 1500000

a: \(=68\cdot72\cdot49\cdot\left[324-324\right]=0\)

b: \(=\left(1250-1250\right)\cdot\left(1+...+100\right)=0\)

\(a,\left(68\times72\times49\right)\times\left(27\times12-9\times36\right)=\left(68\times72\times49\right)\times0=0\\ b,\left(25\times50-125\times10\right)\times\left(1+2+...+100\right)=0\times\left(1+2+...+100\right)=0\)

a, ( 68 × 72 × 49 ) × ( 27 × 12 − 9 × 36 ) = ( 68 × 72 × 49 ) × 0 =

b, ( 25 × 50 − 125 × 10 ) × ( 1 + 2 + ... + 100 ) = 0 × ( 1 + 2 + ... + 100 ) = 0

a) 9 x 24 x 25

=216x25

=5400

b) 12 x 125 x 54

=1500x54

=81000

c) 64 x 125 x 875

=8000x875

=7000000

d) 425 x 7

a) 9 x 24 x 25

b) 12 x 125 x 54

c) 64 x 125 x 875

d) 425 x 7 x4 - 170 x 60

=2975x4 - 170 x 60

=11900- 170 x 60

=11900-10200

=1700

e) 8 x 9 x 14 + 6 x 7 x 12 + 19 x 4 x 18

=1008+504+1368

=2880

a, 568 + 568 x 135 - 568 x 36

= 568 x ( 1 + 135 - 36)

= 568 x 100

56 800

b, 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25

=  49 x ( 17 + 37) + 54 x ( 26 + 25 )

= 49 x 54 + 54 x 51

= 54 x ( 49 + 51)

= 54 x 100

= 5 400

c,   14 x 35 x 5 + 10 x 25 x 7 + 20 x 70

 =    ( 2 x 35) x ( 7 x 5)  + ( 10 x 7) x 25 + 20 x 70

= 70 x 35 + 70 x 25 + 20 x 70

= 70 x ( 35 + 25 + 20)

= 70 x 80

= 5 600 

a) 568 + 568 x 135 - 568 x 36

= 568 x ( 1+1+135-1-36 )

=568 x 100

=5680

b) 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25

= 49 x ( 17 + 37 ) + 54 x ( 26 + 25 )

= 49 x 54 + 54 x 51

= 54 x ( 49 + 51 )

= 54 x 100

= 5400

c) 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70

= 70 x 35 + 10 x 25 x 7+ 20 x 70

= 70 x 35 + 250 x 7 + 20 x 70

= 70 x 35 + 70 x 25 + 20 x 70

= 70 x (35+25+20)

= 70 x 80

= 5600

a = 5400 

b = 81000

c = 7 000 000 

d = 108800 

e = 3600 nhé bạn 

k cho mình nha , cảm ơn nhiều

a,9 x 24 x 25= 5.400

b,12 x125 x54= 81.000

c,64 x 125 x 875 =7.000.000

d,425 x 7 x 4 - 170 x 60=1.700

e,8 x 9 x 14 + 6 x 17 x 12 +19 x 4 x18=3.600

a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370

a) 4 x 76 + 76 x 7
= (4 + 7) x 76
= 11 x 76
= 836
b) 4 x 54 + 54 x 2 + 5 x 54
= (4 + 4 + 5) x 54
= 13 x 54
= 702
c) 37 + 3 x 37 + 5 x 37 + 2 x 37
= 37 x (3 + 5 + 2)
= 37 x 10
= 370

a) 4 x 76 + 76 x 7

= (4 + 7) x 76

= 11 x 76

= 836.

b) 4 x 54 + 54 x 2 + 5 x 54

= (4 + 2 + 5) x 54

= 11 x 54

= 594.

c) 37 + 3 x 37 + 5 x 37 + 2 x 37

= 37 x (3 + 5 + 2 + 1)

= 37 x 11

= 407.

Tính nhanh:

a, 18,25 - 3,78 + 1,58

= 18,25 - ( 3,78 + 1,58 )

= 18,25 - 5,36

= 12,89

b, 183 x ( 48 + 54 ) - 83 x ( 54 + 48 )

= 183 x 102 - 83 x 102

= 102 x ( 183 - 83 )

= 102 x 100

= 10200

c, 2,4 x 178 x 2 - 3 x 78 x 1,6

= ( 2,4 x 178 x 2 ) - ( 3 x 78 x 1,6 )

= ( 427,2 x 2 ) - ( 3 x 124,8 )

= 854,4 - 374,4

= 480

d, 3,9 x 138 - 7,8 x 19

= ( 3,9 x 138 ) - ( 7,8 x 19 )

= 538,2 - 148,2

= 390.

giúp mik ik mn ưi

a: =18,25-2,2=16,05

b: \(=102\cdot\left(183-83\right)=10200\)

c: \(=4.8\cdot178-4.8\cdot78=4.8\cdot100=480\)

d: \(=3.9\cdot138-3.9\cdot38=3.9\cdot100=390\)

\(a,892^2+216.892+108^2=892^2+2.108.892+108^2=\left(892+108\right)^2=1000^2=1000000\)

b, \(9x^2+42x+49=9.1^2+42.1+49=9+42+49=100\)

c,\(\left(x^2-3x\right)+x-3=x\left(x-3\right)+\left(x-3\right)=\left(x+1\right)\left(x-3\right)=\left(6+1\right)\left(6-3\right)=7. 3=21\)