ko biết dùng máy tính tính à

5 - ( 48 - 703 + 125 ) + ( 48 - 703 + 12 ) + 125

= 5 - ( - 503 ) + ( - 643 ) + 125

= 508 + ( - 643 ) + 125

= - 135 + 125

= - 10

   5 - ( 48 - 703 + 125 ) + ( 48 - 703 + 12 ) + 125
= 5 - 48 + 703 - 125 + 48 - 703 + 12 + 125
= 5 + ( 48 - 48 ) + ( 703 - 703 ) + 12 + ( 125 - 125 )
= 5 + 0 + 0 + 12 + 0 = 17

a, ( - 5 ) . ( - 7 ) . 4 . 20 . ( - 25 )

= -70000

 b, ( - 16 ) . 73 + ( - 16 ) . 27

= -1600

c, ( - 48 ) . 159 - ( - 48 ) . 59

= -4800

d , 72 . ( - 83 ) + ( - 72 ) . ( - 125 )

= 3014

e , ( - 81 ) . 125 - 181 . ( - 125 )

= 12500

#Hoctot

a -70000.0000 

b-1600.000000

c-4800.000000

d-4968.000000

e-12500.00000

a, 70000

b, 1600

c, 4800

d, 3014

e, 12500

Trả lời :

       \(48\cdot125\cdot5\)

\(=6\cdot8\cdot125\cdot5\)

\(=\left(6\cdot5\right)\cdot\left(125\cdot8\right)\)

\(=30\cdot1000\)

\(=30000\)

\(48\times125\times5=30000\)

 48*125*5

=6000*5

=30000

K mk nhé bn,Hok tot

\(-\left(125+48+11\right)-\left(15-5-21\right)\)

\(=-125-48-11-15+5+21\)

\(=-140+5-48+10\)

\(=-130-43\)

=-173

a: =250:{5*(78-28)}

=250:{5*50}

=1

b: \(=3\cdot\left\{150:\left[152-77\right]\right\}\)

=3*{150:75}

=3*2=6

c: \(=12:\left\{390:\left[500-125-245\right]\right\}\)

=12:3=4

d: =100-[16*5+88]:28

=100-6=94

5^{2x + 1} = 125

=> 5^{2x + 1} = 5³

=> 2x + 1 = 3

=> 2x = 3 - 1

=> 2x = 2

=> x = 2 : 2

=> x = 1

3 . 4^x = 48

4^x = 48 : 3

4^x = 16

=> 4^x = 4²

=> x = 2

Nhớ tick cho mik nha !!!

5^2x+1=125

=>5^2x+1=5^3

2x+1=3

2x=3-1

2x=2

x=2:2

x=1

3.4^x=48

12^x=48

=>x=2

tick cho mk nha bạn

\(a,\\ 52^2+52.48=52.52+52.48=52.\left(52+48\right)=52.100=5200\\ b,\\ 39^2-39.29=39.39-39.29=39.\left(39-29\right)=39.10=390\\ c,\\ 99.5^3+125=99.125+125=125.\left(99+1\right)=125.100=12500\)

a) 52² + 52 . 48 = 2704 + 2496 = 5200

b) 39² - 39 . 29 = 1521 - 1131 = 390

c) 99 . 5³ + 125 = 99 . 125 + 125 = 12375 + 125 = 12400

\(2\sqrt{27}-\sqrt{\dfrac{16}{3}}-\sqrt{48}-\sqrt{8\dfrac{1}{3}}\)

\(=6\sqrt{3}-4\sqrt{\dfrac{1}{3}}-4\sqrt{3}-5\sqrt{\dfrac{1}{3}}\)

\(=2\sqrt{3}-9\sqrt{\dfrac{1}{3}}\)

\(=2\sqrt{3}-3\sqrt{9\cdot\dfrac{1}{3}}\)

\(=2\sqrt{3}-3\sqrt{3}\)

\(=-\sqrt{3}\)

________________________

\(\left(\sqrt{125}-\sqrt{12}-2\sqrt{5}\right)\left(3\sqrt{5}-\sqrt{3}+\sqrt{27}\right)\)

\(=\left(5\sqrt{5}-2\sqrt{3}-2\sqrt{5}\right)\left(3\sqrt{5}-\sqrt{3}+3\sqrt{3}\right)\)

\(=\left(3\sqrt{5}-2\sqrt{3}\right)\left(3\sqrt{5}+2\sqrt{3}\right)\)

\(=\left(3\sqrt{5}\right)^2-\left(2\sqrt{3}\right)^2\)

\(=15-12\)

\(=3\)

bạn viết lại đề câu a.

a)  298  x  47  - 298  x  27

=   298 x ( 47 - 27 )

=   298 x 20

=   5960

b) 954 + 954 x 147 - 954 x 47

=  954 x ( 147 - 47 )

=  954 x 100

=  95400       

c)   120 : 5 + 380 : 5

= ( 120 + 380 ) : 5

=    400 : 5

=    80

d) ( 125 x 48 ) : 6        

=   6000 : 6

=   1000

a) 298 x 47 - 298 x 27.

= 298 x (47 - 27).

= 298 x 20 = 5960.

b) 954 + 954 x 147 - 954 x 48.    

= 954 x (1 + 147 - 48).

= 954 x (148 - 48).

= 954 x 100 = 95400.

c) 120: 5 + 380 : 5.

= (120 + 380) : 5.

= 500 : 5 = 100.

d) (125 x 48 ): 6    

= (125 x 6 x 8) : 6.

= 125 x 8.

= 25 x 5 x 8.

= 25 x 40 = 1000.