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

=

Hướng dẫn giải:

a) 71 x 5 x 4 = 71 x (5 x 4) = 71 x 20 = 1420

b) 123 x 50 x 2 = 123 x (50 x 2) = 123 x 100 = 12300

c) 4 x 138 x 25 = (4 x 25) x 138 = 100 x 138 = 13800

d) 25 x 96 x 4 = (25 x 4) x 96 = 100 x 96 = 9600

e) 5 x 81 x 2 = (5 x 2) x 81 = 10 x 81 = 810

g) 50 x 104 x 2 = (50 x 2) x 104 = 100 x 104 = 10400

a: =25(15+45*3)

=25*150

=3750

b: \(=-10\left(25+75-50\right)=-10\cdot50=-500\)

c: =>3^x-2=27

=>x-2=3

=>x=5

d: =>2x-5=-4

=>2x=1

=>x=1/2

e: =>2(x-1)^2=32

=>(x-1)^2=16

=>x-1=4 hoặc x-1=-4

=>x=-3 hoặc x=5

f:  =>25(x+3)=75

=>x+3=3

=>x=0

`@` `\text {Ans}`

`\downarrow`

`2.x + 25 + 3.x = 50`

`\Rightarrow x.(2 + 3) = 50 - 25`

`\Rightarrow 5x = 25`

`\Rightarrow x = 25 \div 5`

`\Rightarrow x = 5`

Vậy, `x = 5.`

cíuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

a) 450 – ( 25 – 10) = 450 – 15

                   = 435

450 – 25 – 10 = 425 – 10

                   = 415

b) 180 : 6 : 2 = 30 : 6

                   = 15

180 : ( 6 : 2 ) = 180 : 3

                   = 60

c) 410 – (50 +30) = 410 -80

                   = 330

410 - 50 + 30 = 360 + 30

                   = 390

d) 16 x (6 : 3) = 16 x 2

                   = 32

16 x 6 : 3 = 96 : 3

                   = 32

1/2×(2×x-3)+105/2=-137/2

1/2×(2×x-3)=-137/2-105/2

1/2×(2×x-3)=-242/2

2×x-3=-242/2:1/2

2×x-3=-242

2.x=(-242)+3

2.x=239

x=239:2

x=239/2

A,-12×25-25×75-25×13

=[(-12)-75-13].25

=(-100).25

-2500

B,-50/7×49/10-35/2×-10/7+ -25/3× -9/5

=(-35)-(-25)+(-13)

=-23

C,-354+265-156+125

=[(-354)-156]+(265+125)

=(-510)+277

=-233

D,-74+40-50+16-35

=(-74)+40+(-50)+16+(-35)

=[(-74)+(-35)]+[40+(-50)+16]

=(-109)+26

=-83

E,-2/3×4/5+-4/5×4/3-0,125

=-2/3.4/5+4/5.(-4/3)-0,125

=4/5.[-2/3+(-4/3)]-0,125

=4/5.(-2)-0,125

=-8/5-0,125

=(-1,6)+(-0,125)

=-1,725

\(50+90=90+50=140\)

\(90+600=600+90=690\) .

\(x:2=50+20\)

\(\frac{x}{2}=70\)

 \(x=70.2=140\)

\(x+25=\frac{100}{25}\)

\(x+25=4\)

\(x=4-25\)

\(x=-21\)

50 + 90 = 90 + 50

90 + 600 = 600 + 90

Tìm x 

x : 2 = 50 + 20

x : 2 = 70

x = 70 * 2

x = 140

x + 25 = 50 *2

x + 25 = 100

x = 100 - 25

x = 75

50+90 = 140

90+ 600= 690

x : 2 = 50+20

x : 2 = 70

x      = 70:2

x     = 35

x + 25 = 100 : 25

x + 25 = 4

x        = 25+4

x        = 29

k mình đúng nhea :>

`(x+5)/(x^2-5x)-(x-5)/(2x^2+10x)=(x+25)/(2x^2-50)`

ĐK:`x ne 0,x ne 5,x ne -5`

Nhân 2 vế với `2x(x+5)(x-5)` ta có phương trình:

`2(x+5)(x+5)-(x-5)(x-5)=x(x+25)`

`<=>2(x^2+10x+25)-(x^2-10x+25)=x^2+25x`

`<=>x^2+30x+25=x^2+25x`

`<=>5x+25=0`

`<=>5x=-25`

`<=>x=-5(l)`

Vậy pt vô nghiệm

= 50 x ( 75 - 25 + 50 )

= 50 x 100 

= 5000

=5000

Tính thuận tiện hở bạn?

75 x 50 - 25 x 50 + 50 x 50

= ( 75 - 25 + 50 ) x 50

= ( 50 + 50 ) x 50

= 100 x 50

= 5000

hok tốt ha~~~~~