1/2,2/5,1/3,5/14,(),13/27.备选A,7/20,B,4/7,C,5/11,D,2/5
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(x-14):(5分之3x+14)=1:2
-1/63/(3/14-2/9+1/7-1/3)+(-2/5)*1/5等于多少?
4(2x-1)-3(5x+1)=14
4(2x-1)-3(5x+1)=14
5/2 7/5 1 14/17 ( )
3/22除以【5/4除以(14/3-1/2)】
1/3x-14=5/3x+2
-3又1/2+5又3/5÷(-2)×5/14
(27/8)^-2/3+0.002^-1/2-10*((5^(1/2))-2)^-1+14/9
7/5×3/2+14/15÷1/9
(3/7+5/14+1/2)*28 简便运算
3分之2x-5分之1x=14
2.75-(-1/2)+(-5/6)-(-0.375)-14/3
1,3,2,6,5,15,14,( ),( ),123
(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)
1/3*(2又14/3-2/7)*(-8/5)*(-5/16)
1-3/5+1/2-2/5
-14*3/5-0.34*2/3+2/5*(-14)-1/3*0.34用简便方法计算