Đáp án B

Đáp án B

b

Tổng hai số là:    1000 x 2 =  2000

Số thứ nhất :   (2000 +  640) :  2 = 1320

Số thứ nhất :    2000 - 1320 = 680

Tổng 2 số là : 

1000 x 2 = 2000 

Số thứ nhất là : 

( 2000 + 640 ) : 2 = 1320 

Số thứ hai là : 

2000 - 1320 = 680 

              Đ/s :       Số thứ 1 : 1320 

                            Số thứ 2 : 680 

Tk mk nha !!! 

tổng hai số là

1000.2=2000

số thứ hai là

(2000-640)/2=680

số thứ nhất là

680+640=1320

đáp số:số thứ nhất:1320

             số thứ hai 680

. là dấu nhân nhé

chúc bạn hok tốt

tong 2 so la: 262x2= 524

so1 la:(524 + 226) :2 =375

so2 la :524 - 375= 149

Tổng của hai số là 

262x2=524

Số thứ hai là 

(524-226):2=149

Số thứ nhất là 

(524+226):2=375

  Đáp số.......

Nếu giảm số thứ hai đi 468 đvị thì được số thứ nhất => Số thứ hai hơn số thứ nhất 468 đvị

Tổng hai số là 

1000x2=2000

Số thứ nhất là 

(2000-468):2=766

Số thứ hai là

(2000+468):2=1234

  Đáp số.........

Trung binh cong cua ca 4 so la: (4,2-0,6):3=1,2

So thu tu la:1,2-0,6=0,6

                            Dap so : 0,6

(a+b+c)/3=4.2

(a+b+c+d)/4=d+0.6

hay (4.2+d)/2 =d+0.6

4.2+d=2d+1.2

d=3

Số thứ hai là:

\(2000\cdot\dfrac{3}{5}=1200\)

Số thứ nhất là 

2000-1200=800

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B nha bạn

B . 1320 và 680