1-2-3-4-5-6-7-8-9-0+4+9+1+2+3+4+5:3:5:6:67:8:96+7+8+9+9-2-3-4-5-6-7-8-9-2+4+2+1+3+4+5+6+7+9+0+8+67?

LÂY BÚA CHAC ĐẦU ĐUÔI HỎI =?

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

đố đó

\(A=1*2*3*4*5*6*7*8*9-1*2*3*4*5*6*7*8-1*2*3*4*5*6*7*8*8\)

1+2+3+4+5+6+7+8+9+0+1+2+3+4+5+6+7+8+9+9+8+7+6+5+4+3+2+1+1+34+4+6+7+8+97+6+4+3+32+4+57+7+8+8+6+65+4+3+3+46+7+8+7+64+3+3+5+68+8+6+3+3+5+78+8+6+54+5+7+8+852+3+5+89+8+5+45+7×9×9×9×9×9×9×9×9×9×9×9×8×8×7×9×9×7×7×87×7×8×7×7×8×7×7×8

Hãy điền các dấu +,-,x,:,( ), ngoặc vuông, ngoặc nhọn,... để kết quả là -1

1...2...3...4=-1

1...2...3...4...5=-1

1...2...3...4...5...6=-1

1...2...3...4...5...6...7=-1

1...2...3...4...5...6...7...8=-1

1...2...3...4...5...6...7...8...9=-1

1...2...3...4...5...6...7...8...9...10=-1

a) 1*2*3*4*5*6*7*8*9

b) 2*2*3*3*4*4*5*5*6*6*7*7*8*8*9*9

Tính

1/ (-6 – 2). (-6 + 2)

2/ (7. 3 – 3) : (-6)

3/ (-5 + 9) . (-4)

4/ 72 : (-6. 2 + 4)

5/ -3. 7 – 4. (-5) + 1

6/ 18 – 10 : (+2) – 7

7/ 15 : (-5).(-3) – 8

8/ (6. 8 – 10 : 5) + 3. (-7)

Tính

1/ (-6 – 2). (-6 + 2)

2/ (7. 3 – 3) : (-6)

3/ (-5 + 9) . (-4)

4/ 72 : (-6. 2 + 4)

5/ -3. 7 – 4. (-5) + 1

6/ 18 – 10 : (+2) – 7

7/ 15 : (-5).(-3) – 8

8/ (6. 8 – 10 : 5) + 3. (-7)

A = 1+ 5+ 5^2 + 5^3 + 5^4 + 5^5 + 5^6 + 5^7 + 5^8 + 5^9

      1 + 5 + 5^2 + 5^3 + 5^4 + 5^5 + 5^6 + 5^7 + 5^8

B = 1 + 3 + 3^2 + 3^3 + 3^4 + 3^5 + 3^6 + 3^7 + 3^8 + 3^9

      1 + 3 + 3^2 + 3^3 + 3^4 + 3^5+ 3^6 +3^7 + 3^8

So sánh A; B

1*2*3*4*5*6*7*8*9-1*1*2*3*4*5*6*7*8-1*2*3*4*5*6*7*8^2 =................

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