1/3X1/5=1/15=(1/3-1/5)X1/2,1/5X1/7=1/35=(1/5-1/7)X1/2,1/7X1/
2个回答
1/3X1/5=1/15=(1/3-1/5)X1/2,
1/5X1/7=1/35=(1/5-1/7)X1/2,
1/7X1/9=( 1/63)=(1/7-1/9 )X(1/2 )
相关问题
40x=35*(x=4) 7:5=(1/2x):(1/2-42) 3:5=x:(20-x) 1.5x=1.25*(x+1
5x+3/7=3/7x-1/15=1/5x-(1/2-1/3)=1/6必采!就三题!→~→
2/1 X 3/1 +12/5 X 2/1 5/4 X7/5 -2/1 (6+15/2)X5
计算:1/1x3+1/3x5+1/5x7+.+1/31x33+1/33x35,
1X1/3+3X1/5+5X1/7+7X1/9+.+99X1/101=?
1/1X3+1/3X5+1/5x7+1/7+9+…+1/49x51=?
1:1/2x-7=9x-2/62:1/5x-1/2(3-2x)=13:2x+1/3-5x-1/6=14:1/7(2x+1
1/4x-1/2=3/4;7x-5/4=3/8;2x-1/6=5x+1/8;1/2x-7=9x-2/6;1/5x-1/2
解方程:[1/5](x+15)=[1/2]-[1/3](x-7)
1.(2x²-3x-7)乘5x-7(1-5x)