a) \(\left(-4\right)\left(-3\right)\left(-125\right).25.\left(-8\right)=\left[25\left(-4\right)\right]\left[\left(-125\right)\left(-8\right)\right]\left(-3\right)\)

\(=\left(-100\right).1000.\left(-3\right)=300.1000=300000\)

b) \(\left(-4\right).9\left(-125\right).25.\left(-8\right)=\left[25\left(-4\right)\right]\left[\left(-125\right)\left(-8\right)\right].9\)

\(=\left(-100\right).1000.9=\left(-100\right).9000=-900000\)

c) \(7.\left(-25\right)\left(-3\right).2.\left(-4\right)=\left[\left(-25\right)\left(-4\right)\left(-3\right)\right].7.2=-4200\)

d) \(\left[93-\left(20-7\right)\right]\div16=\left(93-13\right)\div16=80\div16=5\)

e) \(53-\left(-51\right)+\left(-53\right)+49=\left(53-53\right)+\left(51+49\right)=100\)

f) \(168-49+\left(-68\right)+4=168-49-68+4=55\)

a, 16.(27+15)+8.(53+25):2

= 4.[(27+15).4] + 4.(53+25)

= 4.168 + 4.312

= 4.(168+312)

= 4.480=1920.

...

Câu b tình bt thui!

b, 53.(51+4)+53.53.(49+96)+53

=53.55+53.53.145+53

=2915+407305+53

=410220+53=410273

d,125.98.2.8.25

= 25.2.2.98.2.2.2.2.25.

= [(25.2.2.2)+(25.2.2.2)].98.

= (200 + 200).98.

= 400 . 98 = 39200.

7)

53.(51+4)+53.(49+96)+53

=53.55+53.145+53

=53.(55+145+1)

=53.201

=10653

8)

42.(15+96)+6.(25+4).7

=42.111+(6.7).29

=42.111+42.29

=42.(111+29)

=42.140

=5880

9)

45.(13+78)+9.(87+22).5

=45.91+(9.5).109

=45.91+45.109

=45.(91+109)

=45.200

=9000

10)

16.(27+75)+8.(53+25).2

=16.102+(8.2).78

=16.102+16.78

=16.(102+78)

=16.180

=2880

7)

53.(51+4)+53.(49+96)+53

=53.55+53.145+53

=53.(55+145+1)

=53.201

=10653

8)

42.(15+96)+6.(25+4).7

=42.111+(6.7).29

=42.111+42.29

=42.(111+29)

=42.140

=5880

9)

45.(13+78)+9.(87+22).5

=45.91+(9.5).109

=45.91+45.109

=45.(91+109)

=45.200

=9000

10)

16.(27+75)+8.(53+25).2

=16.102+(8.2).78

=16.102+16.78

=16.(102+78)

=16.180

=2880

ko phải toán lớp 6

5) 24*(15+49)+12*(50+42)

=24*64+12*92

=24*64+12*2*46

=24*64+24*46

=24*(64+46)

=24*110

=2640

7) 53*(  51+4)+53*(49+96)+53

=53*55+53*145+53

=53*(55+145)+53

=53*200+53

10600+53

=10653

a) 15 . (27 + 18 + 6 ) + 15 . ( 23 +12 ) =  15. 51 + 15 . 35 = 765 + 525 = 1290

b) 14 . 35 . 5 + 10 . 25 . 7 + 20 . 70 = 2450 + 1750 + 1400 = 2452450

c) 53 . ( 51 + 4 ) + 53 . ( 49  + 96 ) + 53 = 53 . 55 + 53 . 145 + 53 = 2915 . 7685 = 22401775

d) 46 . ( 27 +75 ) +8 . ( 58 + 25 ) + 8 . ( 58 + 25 ) . 2 = 46 . 102 + 8 . 83 + 8 . 83 =  4692 + 664 + 664 = 6020

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