1 2 4 5 7 ()()
1 2 4 5 7 ()()
(2+5+8+...+2000)-(1+4+7+...+1999)
1/9{7【1/5(x+4)+1】-5}=1 (4x-7)/5-(5x-4)/2=(14-x)/4
1,2,4,7,(),(),().
谁能算24点?(4 11 8 9) (2 13 1 10 )(7 13 4 5)(5 11 12 6)(7 7 7 7)
1.(-2 3/4)+(+12 5/7)+(-4.125)+(+0.75)+(+1/8);
【1】(7/9+5/6)除以1/18 【2】1/5*4除以2/5
1/2+3/4-6/5 6/7-1/2+4/5 3/4-(7/12-5/7) 2/3+(13/15+1/3) 15/9-
(1)5×根号7-8×根号7(2)4×根号5-(根号6+2×根号5)
(1+2+3+4+5+6+7+8+7+6+5+4+3+2+1)÷(888888×888888)
数列找规律!(1)1,2,-3,-4,5,6,-7,-8(2)-1,-1/2,1/3,1/4,-1/5,-1/6,1/7
(1) 1,1/3,1/5,1/7,1/9 (2)- 1/2*1,1/2*2,- 1/2*3,1/2*4,-1/2*5