1 : Tính nhanh:

a) 2376 + 3425 - 376 - 425 = ( 2376 - 376 ) + ( 3425 - 425 )

                                       = 2000 + 3000

                                       = 5000

b)4638 - 2437 + 5362 - 7563 = 2210 + ( - 2210 )

                                          = 0

c) 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15

  = 45 x 4 + 15 x 4

 = ( 45 + 15 ) x 4

 = 60 x 4

 = 240

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

                            = 100 x 1000

                            = 100000

e) 2 x 8 x 50 x 25 x 125 = ( 2 x 50 ) x ( 8 x 125 ) x 25

                                   = 100 x 1000 x 25

                                   = 100000 x 25

                                   = 2500000

2 : Tính nhanh bằng 2 cách:

C1 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25

    = ( 125 - 25 ) + ( 125 - 25) + ( 125 - 25 ) + ( 125 - 25 )

    =100 + 100 + 100 + 100 

    = 100 x 4 

    = 400

C2 : 125 + 125 + 125 + 125 - 25 - 25 - 25 - 25

     = 125 x 4 - 25 x 4

     = ( 125 - 25 ) x 4

     = 100 x 4

     = 400

1.

a. 5000
b. 0

c. 240

d. 100000

e. 2500000

2.

400

1: Tính nhanh:

a, 2376 + 3425 - 376 - 425

 = ( 2376 - 376 ) + ( 3425 - 425 )

 = 2000 + 3000

 = 5000.

b, 4638 - 2437 + 5362 - 7563

 = 2210 + (-2210)

 = 0.

c, 45 + 45 + 45 + 45 + 15 + 15 + 15 + 15 + 15

 = ( 45 + 15 ) +  ( 45 + 15 ) +  ( 45 + 15 ) +  ( 45 + 15 ) 

 = 60 + 60 + 60 + 60

 = 240.

d, 4 x 125 x 25 x 8 

 = ( 4 x 25 ) x ( 125 x 8 )

 = 100 x 1000

 = 100000.

e, 2 x 8 x 50 x 25 x 125

 = ( 2 x 50 ) x ( 8 x 125 ) x 25

 = 100 x 1000 x 25

 = 2500000.

2: Tính nhanh bằng hai cách:

  125 + 125 + 125 + 125 - 25 - 25 - 25- 25

= ( 125 - 25 ) + ( 125 - 25 ) + ( 125 - 25 ) + ( 125 -25 )

= 100 + 100 + 100 + 100

= 400.

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: =34x(-100)=-3400

b: =41(-76-24)=-4100

c: =-24(125-225)=2400

d: =26(-237+137)=-2600

e: =25(-63+23)=25x(-40)=-1000

a; (-13).34 - 87.34

= 13.34 - 87.34

=   -34.(13+ 87)

= - 34.100

= 3400

b; 74.(-41) - 41.26

= -74.41 - 41.26

= - 41.(74 + 26)

= - 41.100

= - 4100 

c; 125.(-24) + 24.125

= 24.(- 125  + 225)

= 24.100

= 2400

d; 237.(-26) + 26.137

= -26.(237 - 137)

= -26. 100

= -2600

-25

-125+(X+125)=-25

X+125=-25+125

X+125=100

X=100-125

X=-25

vì 5^3 = 125 

=> 1/125 - 1/125 = 0 

=> (1/125-1^3)x(1/125-2^3)x...0x...x(1/125-25^3=0

a)\(\left(2x+1\right)^3=5^3\)

\(\Rightarrow2x+1=5\)

\(2x=5-1\)

\(2x=4\)

\(x=4:2\)

\(x=2\)

\(b,\left(2x-1\right)^3=125\)

\(\Rightarrow2x-1=5\)

\(2x=5+1\)

\(2x=6\)

\(x=6:2=3\)

b) \(\left(2x-1\right)^3=125\)

\(\left(2x-1\right)^3=5^3\)

\(2x-1=5\)

\(2x=5+1\)

\(2x=6\)

\(x=6:2\)

\(x=3\)

c) \(4x^3+15=19\)

\(4x^3=19+15\)

\(4x^3=34\)

\(x^3=\frac{34}{4}=\frac{17}{2}\)

Chỗ này có vẻ hơi sai sai ạ :33

124. 4=500

a, = -500

b,=-500

c,= -500

125. 4=500

a.125. 4 =500

=> (-125). 4= -500

b.125. 4=500

=> (-4). 125= -500

c.125. 4=500

=> 4. (-125) = -500

tính máy đê

-125+(X+125)=-25

X+125=-25+125

X+125=100

X=100-125

X=-25

x+125=-25-(-125)

x+125=100

x=100-125

x=-25

x+125=-25+125

x+125=100

x=100-125

=-25