( ):12=1/4:1/3=0.3/( )=12/( )=( )%

( ):12=1/4:1/3=0.3/( )=12/( )=( )% 上面写不下,我写在下面填符号1.(1)1/2( ）0.4( )3/10( )0.1=1 (2)1/2( )0.4( )3/10( )1/5( )0.1( )=10 2.(1)0.3( )0.3( )0.3( )0.3( )0.3=0 (2)0.3( )0.3( )0.3( )0.3( )0.3=1 (3)0.3( )0.3( )0.3( )0.3( )0.3=2 (4)0.3( )0.3( )0.3( )0.3( )0.3=4 3.(1)0 按运算结果的要求,添上运算符号和括号 1/2 0.4 3/10 1/5 0.1=10 0.3 0.3 0.3 0.3 0.3=00.3 0.3 0.3 0.3 0.3=10.3 0.3 0.3 0.3 0.3=20.3 0.3 0.3 0.3 0.3=4 数学题（加括号）（1）0.3 0.3 0.3 0.3 0.3=0（2）0.3 0.3 0.3 0.3 0.3=1（3）0.3 0.3 0.3 0.3 0.3=2（4）0.3 0.3 0.3 0.3 0.3=4（5）0.2 0.2 0.2 0.2 0.2=3（6）0.2 0.2 0.2 0.2 0.2=5（7）0.2 0.2 0.2 0.2 0.2=6（8）0.2 0.2 0.2 0.2 0.2=7 (5x+1/4)-(2x-1/6)=1-(3-x/12)怎么做?还有1-（0.7+3x/0.8)=(0.3x-1/0.4)-x 1,（x+0.8)*2=2.4 2,7x / 4=12+x 3,0.3x-8*0.7=0.1x1,（x+0.8)*2=2.42,7x / 4=12+x3,0.3x-8*0.7=0.1x 4/3x-0.4=2/1*x+0.3 2x+1/6-4x-1/8=1 x-1/0.5-x+2/0.3=2 3/4[3/4(12x+1/4)-8]=3/2x+1怎么算呀?要过程哦.谢了. 12X-1 5X+1 X ---- - ---- = --- 解方程 4 6 3还有一题2X-1 X 1------ = ---- - ---0.7 0.3 7 2/3-【1/12+1/4】= -1/12+(0.3*10/3+1/3)*4 -1/12+(0.3×2/3+1/3)÷|-4| 4【2x-1]-2[10x+1]=3[2x+1]-12 0.3x+0.7[200-x]=108 x+1/5=1-0.3(y-2),4x+9-1.5=y-3/4 , 解方程4/x+1=0.1/0.3x+1+12 x-1/4x=0.3 你们能不能帮我吗?感谢你们真好人.求比值：5：3= 8：5= 17/12= 3:2= 0.3:0.4= 3:0.5= 1/3:1/4= 1/6:1/9=1/5:1= 5/7:2/7= 0.25:1/8= 2:8= 16:12= 56:7= 4:2/5= 45:72= 1/2:3= 2/3:1/6= 3:8/9= 2/9:4= 52/26= 10:8= 1/8:1/10= 1/4:3= 3/4:1/16= 0.6: 12+[2/5×0.75+（1/2+⊕）×3]÷0.3=98则⊕=?