\(31.82+125.48+31.43-125.67\)

\(=31\left(82+43\right)-125\left(67-48\right)\)

\(=31.125-125.19\)

\(=125.12\)

\(=1500\)

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.

4177

13400

3400

5200

4000

4177

13400

3400

5200

4000

29 . 87 - 29 . 23 + 64. 71 = 6400

\(\dfrac{31}{48}\times\dfrac{32}{93}\)

\(=\dfrac{31\times32}{48\times93}\)

\(=\dfrac{1\times2}{3\times3}\)

\(=\dfrac{2}{9}\)

============

\(\dfrac{77}{80}\times\dfrac{48}{49}\)

\(=\dfrac{77\times48}{80\times49}\)

\(=\dfrac{11\times3}{5\times7}\)

\(=\dfrac{33}{35}\)

=============

\(\dfrac{154}{125}\times\dfrac{25}{44}\)

\(=\dfrac{154}{125}\times\dfrac{25}{44}\)

\(=\dfrac{7\times1}{5\times2}\)

\(=\dfrac{7}{10}\)

a) 744 x 24 + 628 x 48

=372 x2 x 24 + 628 x 48

= 48 x (372 + 628)

=      48 x 1000

=        48 000

b) 8 x 132 x 125

=  8 x 125 x132

= 1 000  x 132

=    132 000

= 48875

48 x 125 + 875 x 49 

=\(\text{48 x 49 x ( 125 + 875 ) }\)

= \(\text{48 x 49 x 1000}\)

=\(\text{2352 x 1000}\)

=\(\text{2352000}\)

trl là có like

a)x.124+5276=48304

=>x.124=43028

=>x=347

x:125.64=4608

=>x:125=72

=>x=9000

b)x.45-3209=13036

=>x.45=16245

=>x=361

x:48:25=374

=>x:48=9350

=>x=448800

a:

\(x\times124+5276=48304\\ \Rightarrow x\times124=43028\\ \Rightarrow x=347\\ x:125\times64=4608\\ \Rightarrow x:125=72\\ \Rightarrow x=9000\)

b:

\(x\times45-3209=13036\\ \Rightarrow x\times45=16245\\ \Rightarrow x=361\\ x:48:25=374\\ \Rightarrow x:48=9350\\ \Rightarrow x=448800\)

48 x 125 + 875 x 49 

48 x 49 x ( 125 + 875 ) 

48 x 49 x 1000

2352 x 1000

2352000

K nha

48 x 125 + 875 x 49

= 48 x 125 + 125 x 7 x 49

= 48 x 125 + 125 x 343

= (48 + 343) x 125

= 391 x 125

= 48875

48 x 125 + 875 x 49

= 48 x 125 + 875 x (48 + 1)

= 48 x 125 + 875 x 48 + 875 x 1

= 48 x (125 + 875) + 875 x 1

= 48 x 1000 + 875

= 48000 + 875 

= 48875

1) 1996 + 3992 + 5988 + 7984 
= 1996 x 1 + 1996 x 2 + 1996 x 3 + 1996 x 4 
= 1996 x ( 1 + 2 + 3 + 4) 
= 1996 x 10 = 19960 
2) 2 x 3 x 4 x 8 x 50 x 25 x 125 
= 3 x (2 x 50) x (4 x 25) x (8 x 125) 
= 3 x 100 x 100 x 1000 
= 30.000.000 
3(45 x 46 + 47 x 48) x (51 x 52 - 49 x 48) x (45 x 128 - 90 x 64) 
x (1995 x 1996 + 1997 x 1998) 
Ta thÊy : 45 x 128 - 90 x 64 
= 45 x 2 x 64 - 90 x 64 
= 90 x 64 - 90 x 64 
= 0 

1) 1996 + 3992 + 5988 + 7984 
= 1996 x 1 + 1996 x 2 + 1996 x 3 + 1996 x 4 
= 1996 x ( 1 + 2 + 3 + 4) 
= 1996 x 10 = 19960 
2) 2 x 3 x 4 x 8 x 50 x 25 x 125 
= 3 x (2 x 50) x (4 x 25) x (8 x 125) 
= 3 x 100 x 100 x 1000 
= 30.000.000 
3(45 x 46 + 47 x 48) x (51 x 52 - 49 x 48) x (45 x 128 - 90 x 64) 
x (1995 x 1996 + 1997 x 1998) 
Ta thÊy : 45 x 128 - 90 x 64 
= 45 x 2 x 64 - 90 x 64 
= 90 x 64 - 90 x 64 
= 0 

L I K E NHÁ BẠN^^

1  1996 + 3992 + 5988 +7984

= [ 1996 + 7984 ] + [ 5988 + 3392 ]

=           9980      +            9380

=                         19360

a) x-32:16=48

x-2=48

x=48+2

x=50

Vậy x \(\varepsilon\) {50}

b)(x-32):16=48

x-32=48.16

x-32=768

x=768+32

x=800

Vậy x \(\varepsilon\) {800}

c)Thiếu đầu mối.

d)815-(x-306)=713

x-306=815-713

x-306=102

x=102+306

x=408

Vậy x \(\varepsilon\) {408}.

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