(3/1-5/1-10/1)*30=?

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(3/1-5/1-10/1)*30=?(3/1-5/1-10/1)*30=?(3/1-5/1-10/1)*30=?(3/1-5/1-10/1)*30=1/3*30-1/5*30-1/10*30=10-

(3/1-5/1-10/1)*30=?
(3/1-5/1-10/1)*30=?

(3/1-5/1-10/1)*30=?
(3/1-5/1-10/1)*30 =1/3 *30 -1/5 *30 -1/10 *30 =10-6-3 =1

(3/1-5/1-10/1)*30=? (1/3-1/5-1/10)×30简便计算 将一个分数拆成几个不同单位分数之和(1)由1/5=1/6+1/30,2/5+1/5+1/5=1/5+1/6+1/30,可得3/5=2/5+1/5=(1/5+1/6+1/30)+1/5=1/5+1/6+1/30+(1/10+1/10)=1/5+1/6+1/30+1/10+1/11+1/110同理2/3=1/3+1/3=1/3+( )+( );5/9=9分之1+2+3=1/3+1/9+( )+ (1,5,10),(2,10,20),(3,15,30)( ) (3分之2-10分之1+6分之1-5分之2)除(-30分之1)=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=______1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90 =1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)+1/(9*10) =1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1 (1/2-1/3)+(1/4-1/5)+(1/7-1/10)+(1/14-1/15)+(1/28-1/30)要求简便运算. 下面式子哪些是比例?(1)30:6=5.4:9(2)30÷6=1×5(3)2×10=4×5 (-2分之1-5分之1+10分之3)X(-30)=(含过程) (1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=​?简便计算方法 (1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)=​?简算 (-1/30)除以(-1/10-2/5+1/6-2/3) 计算:(-1/30)/(2/3-1/10+1/6-2/5) 1*3/1+3*5/1+5*7/1+.+2007*2009/1,最好事这样的:1*2/1+2*3/1+...+9*10/1=(1-2/1)+(2/1-3/1)+...+(9/1-10/1)=1-2/1+2/1-3/1+...+9/1-10/1=1-10/1=10/9这只是一个例子. (1/3+x)除以1/5=10 (-1/30)/(2/3-1/10+1/6-2/5)= (1+1/2)*(1+1/4)*.(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)=?请写出过程和道理! 1/(1*3)+1/(2*4)+1/(3*5)+1/(4*6)+...+1/(8*10)=?