5^2+7^2>2*5*7 9^2+10^2>2*9*10 13^2+14^2>2*13*14 5^2+5^2=2*5*
数阵1 2 4 7 11 ...2 5 8 12 ......6 9 13 .........10 14 .......
2^13+2^12+2^11+2^10+2^9+2^8+2^7+2^6+2^5+2^4+2^3+2^2+2+1
1^2+2^2+4^2+5^2+7^2+8^2+10^2+11^2+13^2+14^2+16^2 数学难题计算(简算
1+2+3+4+5+6+7+8+9+10+11+12+13+14+.100=?
1+2+3+4+5+6+7+8+9+10+11+12+13+14+1000=?
2,5,6,9,10,13,14,[ ],[ 】找规律,
1,2,4,5,7,8,9,10,12,13,14,15,16,20题.
2-2^2-2^3-2^4-2^5-2^6-2^7-2^8-2^9+2^10
2×6+6*10+10*14+14*18+18*22分之1*3+3*5+5*7+7*9+9*11+11*13+13*15
11分之6×15分之7×10= 13分之5×7分之4×14= 9分之7×(3分之2-7分之2)=
2,3,6,5,10,7,14,
15.9/7 - ( 2/7 – 10/21 ) 5/9 × 18 – 14 × 2/7 4/5 × 25/16 + 2