(-1/30)/(2/3-1/10+1/6-2/5)=
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10*20*30+2+3+1
1+2+3+10+20+30
(1/2-1/3)+(1/4-1/5)+(1/7-1/10)+(1/14-1/15)+(1/28-1/30)(1/2-1/3)+(1/4-1/5)+(1/7-1/10)+(1/14-1/15)+(1/28-1/30)
2(x+1)-3(y-1)=10 2(x+1)+3(y-1)=30
(1/2+1/4+1/6+1/10+1/12+1/60)/(1+1/3+1/5+1/10+1/15+1/30)
(1,5,10),(2,10,20),(3,15,30)( )
(1+1/3+1/5+1/10+1/15+1/30)/(1/2+1/4+1/6+1/12+1/20+1/60)(用简算)
(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
解方程:10/(2/3x)+30[1/x+1/(2/3x)]=1
1-10/2x/3=(1/X+1/2X/3)*30 解分式方程
下面是某同学计算(- 1 30 )÷( 2 3 - 1 10 + 1 6 - 2 5 (- 1 30 )÷( 2 3 - 1 10 + 1 6 - 2 5 ) =(- 1 30 )÷ 2 3 +(- 1 30 )÷(- 1 10 )+(- 1 30 )÷ 1 6 +(- 1 30 )÷(- 2 5 ) =(- 1 30 )× 3 2 + 1 30 ×14- 1 30 ×6+ 1 30 × 5细心的你能否看出上
1/2 1/10 1/30 1/68()
10/(1*2)+20/(1*2*3)+30/(1*2*3*4)+40/(1*2*3*4*5)++...+90/(1*2*3*4*.10)
计算(2/3-1/10+1/6-2/5)÷(-1/30) 要过程
(-1/30)除以(2/3-1/10+1/6-2/5).巧算
(-1/30)除以(-1/10-2/5+1/6-2/3)
(-1/30)÷(2/3-1/10+1/6-2/5)计算怎样算?