3/4-7/2+(-1/6)-(-2/3)-1
3/4*6/7除以(1/2+2)-2/7
1+2+3+4+5+6+7
1×2×3×4×5×6×7
1 2 3 4 6 7
1,2 ,3,4,5,6,7
:(1/2+2/3+3/4+4/5+5/6+6/7)+(1/2+2/3+3/4+4/5+5/6+6/7)*1/2—(1+
(-7)+11+3+(-2) 1/4+(-2/3)+5/6+(-1/4)+(-1/3)等于几
1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7
1*3*5+2*6*10+7*21*35分之1*2*3+2*4*6+7*14*21 =[1*2*3*(1+2*2*2+7
1+2+3+4+5+6+7+8+9+8+7+4+56+1+2+3
7/2+9/4+(-1/3)-0.25+(-1/6)
1 2 3 4 5 6 7 8=1