4:0.5= 1/6:1/9= 8.1:0.9= 15:0.5= 0.75:1.5= 8/15:4/5= 5/14:2/
4:0.5= 1/6:1/9= 8.1:0.9= 15:0.5= 0.75:1.5= 8/15:4/5= 5/14:2/
解方程:3/4x+0.5×0.75=1 1.5×1/2+0.5x=15/4
(-9)-6= 5-(-10)= 0-(-15)= -(5/6)-(2 1/2)= [(-5)-(-8)]-(-4)=
1=5,2=10,3=15,4=20,5=?6=?7=?8=?9=?10=?
脑筋急转弯 1=5 ,2=10,3=15,4=20,5=?,6=30,7=35,8=40,9=45
2/15*( )=( )*3/4=15*( )=( )*9=1又1/5*( )=1
解方程:(1)2/11-1/10x=18/5 (2)10/9除2/3x=5/6(3)0.75x-5=1.5 (4)0.5
分数计算:7/8-5/6= 2/9+1/2= 2/9*3/5= 5/8*4/15= 7/25*15/14= 4/13*3
2/7+x=6/7.3x-4=0.5.x-1/8-4/15=1/3解方程
2*2-1=1*3;4*4-1=15=3*5;6*6-1=35=5*7;8*8=63=7*9;10*10-1=99=9*
0.5+0.5=1 0.5/0.5=1 ,0.9+0.6=1.5 0.9/0.6=1.5 ,3.2+0.8=4 3.2/
求比值.2:10= 1:0.5= 2.5:5= 9分之1:8= 360:90= 30元:120元= 3:15=