1. a. 1234.2014+2014.8766

= 2014.(1234+8766)

= 2014.10000

= 20140000

b. 1357.2468-2468.357

= 2468.(1357-357)

= 2468.1000

= 2468000

c. (14678:2+2476).(2576-2575)-> (nếu hợp lí thì chỗ này phải là 2576)

= (7339+2476).1

= 9815.1

= 9815

d. (195-13.15) : (1945+1014)

= (195-195) : (1945+1014)

= 0 : (1945+1014)

= 0

2. a. 456+(x-357)=1362

=> x-357=1362-456

=> x-357=906

=> x=906+357

=> x=1263

b. (2345-x)-183=2014

=> 2345-x=2014+183

=> 2345-x=2197

=> x=2345-2197

=> x=148

c. (x-2005).2006=0

=> x-2005=0:2006

=> x-2005=0

=> x=2005+0

=> x=2005

d. 480+45.4=(x+125):5+260

=> 480+180=(x+125):5+260

=> 660=(x+125):5+260

=> (x+125):5=660-260

=> (x+125):5=400

=> x+125=400.5

=> x+125=2000

=> x=2000-125

=> x=1875

e. 2005.(x-2006)=2005

=> x-2006=2005:2005

=> x-2006=1

=> x=1+2006

=> x=2007

g. [(x+50).50-50]:50=50

=> (x+50).50-50=50.50

=> (x+50).50-50=2500

=> (x+50).50=2500+50

=> (x+50).50=2550

=> x+50=2550:50

=> x+50=51

=> x=51-50

=> x=1

Đúng rồi đây các bạn hihi.....

a)(x-2005).2006=0

=>x-2005=0

=>x=2005

b)480+45.4=(x+125):5+260

=>480+180=(x+125):5+260

=>660=(x+125):5+260

=>(x+125):5=400

=>x+125=2000

=>x=1875

c)2005.(x-2006)=2005

=>x-2006=1

=>x=2007

d){(x+50).50-50}:50=50

=>(x+50).50-50=2500

=>(x+50)*50=2550

=>x+50=51

=>x=1

a) (x - 2005 ) . 2006 = 0

x - 2005 = 0 : 2006

x - 2005 = 0

x = 0 + 2005

x = 2005

b) 2005.(x-2006) = 2005

x - 2006 = 2005 : 2005

x - 2006 = 1

x = 1 + 2006

x = 2007

c) 480+45.4=(x+125) : 5 + 260

480 + 180 = (x+125) : 5 + 260

660 = ( x + 125 ) : 5 + 260

660 - 260 = ( x+ 125 ) : 5

400 = ( x + 125 ) : 5

400 x 5 = x + 125

2000 = x + 125

2000 - 125 = x

1875 = x

tương tự

231321131

1231231

4564646+

3123165

1564156

5500 - 375 + 1182 = 6307

8376 - 2453 - 699 = 5224

1054 + 987 - 1108 = 933

1540: 11 + 1890: 9 + 982 = 140 + 210 + 982 = 1332

7080-(1000-536) = 6616

2806-(1134+950)-280 = 2806 - 2084 - 280 = 442

1953 + (17432-56.223):16 = 1953 + 4944:16 = 2262

5347 +(2376-734) = 6989

136.(668-558)-404.25 = 14960 - 10100 = 4860

6010-(130.52-68890:83) = 6010 - (6760 - 830) = 80

Bài hơi dài nên nếu mình có làm sai thì bạn thông cảm nha

Tính hợp lí:

1234.2014 + 2014.8766 = 2014.(1234+8766) = 2014.10000 = 20140000

1357.2468-2468.357 = 2468.(1357 - 357) = 2468.1000 = 2468000

(14678:2+2476).(2576-2575) = (7339+2476).1 = 9815

(195-13.15):(1945+1014) = 0:(1945+1014) = 0

( 195 - 195 ) : ( 1945 + 1014 )

= 0 : 2959

= 0

[ (x + 50 ) . 50 - 50] : 50 = 50

 ( x + 50 ) . 50 - 50 = 2500

( x + 50 ) . 50 = 2500 + 50 = 2550

      x + 50 = 2550 : 50 = 51

             x = 51 - 50

            x = 1

480 + 45 . 4 = ( x + 125 ) : 5 + 260

  480 + 180 = ( x + 125 ) : 5 + 260

 ( x + 125 ) : 5 + 260 = 660

         ( x + 125 ) : 5 = 660 - 260 = 400

                         x + 125 = 400 . 5 = 2000

                x             = 2000 - 125 = 1875

1

1875

(195-195):(1945+1014)

=0:2959

=0

[(X+50).50-50]:50=50

(X+50).50-50=2500

X+50=2550::50=51

X=51-50

X=1

480+45.4=(X+125):5+260

480+180=(X+125):5+260

(X+125):5=660-260=400

X+125=400.5=2000

X=2000-125=1875

456 + (x - 357) = 1362

=> x - 357 = 1362 - 456

=> x - 357 = 906

=> x = 906 + 357

=> x = 1263

c) (x - 2005) . 2006 = 0

=> x - 2005 = 0 : 2006

=> x - 2005 = 0

=> x = 0 + 2005 

=> x = 2005

a) 456 + ( x - 357 ) = 1362

=> x - 357 = 906

=> x = 1263

b) ( 2345 - x ) - 183 = 2014

=> 2345 - x = 2197

=> x = 148

c) ( x - 2005 ) . 2006 = 0

=> x - 2005 = 0

=> x = 2005

còn lại làm tương tự

(x - 2005) x 2006 = 0

<=> x - 2005 = 0 

<=> x = 2005

Vậy x = 2005

\(456+\left(x-357\right)=1362\)                        \(\left(2345-x\right)-183=2014\)        

\(x-357=906\)                                               \(2345-x=2197\)

\(x=1263\)                                                            \(x=148\) 

\(\left(x-2005\right).2006=0\)          Phần sau tương tự thế !

\(x-2005=0\)

\(x=2005\)

\(a,456+\left(x-357\right)=1362\)

\(x-357=1362-456\)

\(x-357=906\)

\(x=1263\)

\(b,\left(2345-x\right)-183=2014\)

\(2345-x=2197\)

\(x=148\)

\(c,\left(x-2005\right)\times2006=0\)

\(x-2005=0\)

\(x=2005\)

\(d,480+45\times4=\left(x+125\right):5+260\)

\(480+180=\left(x+125\right):5+260\)

\(660=\left(x+125\right):5+260\)

\(400=\left(x+125\right):5\)

\(x+125=2000\)

\(x=1875\)

\(e,2005\times\left(x-2006\right)=2005\)

\(x-2006=1\)

\(x=2007\)

\(g,[\left(x+50\right)\times50-50]:50=50\)

\(\left(x+50\right)\times50-50=2500\)

\(\left(x+50\right)\times50=2550\)

\(x+50=51\)

\(x=1\)