-2/3+(-1/6)-(-1/4)-1/2=?(-7.8)×1.25×(-8)=?

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-2/3+(-1/6)-(-1/4)-1/2=?(-7.8)×1.25×(-8)=?

-2/3+(-1/6)-(-1/4)-1/2=?(-7.8)×1.25×(-8)=?
-2/3+(-1/6)-(-1/4)-1/2=?(-7.8)×1.25×(-8)=?

-2/3+(-1/6)-(-1/4)-1/2=?(-7.8)×1.25×(-8)=?
=-8/12-(2/12)+(3/12)-(6/12)=(-8-2+3-6)/12=-13/12;
=7.8*(1.25*8)=7.8*10=78

-1/2+(-1/6)-(-1/4)-2/3 (1/2+1/3+1/4+1/6)*24 1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4), 1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4), 1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4), (1+2/1)(1+4/1)(1+6/1).(1+10/)(1-3/1)(1—5/1).(1-9/1) 1.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=2.(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)= 1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=? 1/(1×2×3)+1/(2×3×4)+1/(4×5×6)、、、、+1/(48×49×50) (1/2+1/3+1/4+1/5+1/6+.+1/2013)*(1+1/2+..+1/2012)-(1+1/2+1/3+1/4+...+1/2013)*(1/2+.+1/2012)(1/2+1/3+1/4+1/5+1/6+...+1/2013)*(1+1/2+1/3+1/4...+1/2012)-(1+1/2+1/3+1/4+...+1/2013)*(1/2+1/3+1/4+...+1/2012) 计算((1/3)^2)×4^0+((1/3)^4)×4^1+((1/3)^6)×4^2+…+((1/3)^2n)×4^(n-1) (1-1/2)+ (1/3-1/4)+ (1/5-1/6)...+ (1/99-1/100)=? 1/6【1/4{1/3(1/2X-1)+3}+5】=1 1/2 + 1/6 + 1/12 + 1/20 + 1/30+ 1/42 + 1/56 + 1/72=(1+ 1/2+ 1/3+ 1/4+ 1/5)×(1/2+ 1/3+ 1/4+ 1/5+ 1/6)-(1+ 1/2+ 1/3+ 1/4+1/5+ 1/6)×(1/2+ 1/3+ 1/4+ 1/5) 巧算:(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5-1/6)-(1/6+巧算:(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5-1/6)-(1/6+1/7)-(1/7+1/8) 2/9除以【(1/2+1/6)*3/4】 (-1/4)+5/6+2/3-1/2 1 3/4-5/6-(+1 1/6)-(-1/2)