Question

tinh nhanh

1+2+3-4+5+6-7+8+9=?

 

Answer 1

\(1+2+3-4+5+6-7+8+9\\ =1+2+\left(5+3-4\right)+\left(8+6-7\right)+9\\ =1+2+4+7+9\\ =\left(1+2+7\right)+\left(9+4\right)\\ =10+13\\ =23\)

Answer 2

1 + 2 + 3 - 4 + 5 + 6 - 7 + 8 + 9 = 23 nhé bạn

Tk mk nhé

Answer 3

bang 23

dung 10000000000000000000000000000000% lun

Answer 4

(1+9)+(2+8)+(3+7)+(4+6)+5

10+10+10+10+5

40+5

45

Answer 5

\(1+2+3+4+5+6+7+8+9\\ =\left(1+9\right)+\left(2+8\right)+\left(3+7\right)+\left(4+6\right)+5\\ =10\times4+5\\ =40+5\\ =45\)

Answer 6

(1+9)+(2+8)+(5+6)-(7-4)=10+10+11-11=20

Answer 7

1+2+3-4+5+6-7+8+9=1+2+(3-4+5)+(6-7+8)+9

                                    =12+4+7

                                    =12+11

                                    =23

Chọn mình nha

Answer 8

1 + 2 + 3 - 4 + 5 + 6 - 7 + 8 + 9 = 1 + 2 + 3 + 5 + 6 + 8 + 9 - 4 - 7 = 34 - 11 = 23

ok hông?