25比7等于y比35用方程怎么解
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600/(3x)=1920200/x=19201920x=200x=5/48
1.x=25*(25/7)=625/72.x=13*(15/56)=195/563.x=35*(57/514)=1995/5144.x=2*(34/54)=34/275.x=81*(0.75/25)=
3:2=0.5:Y3Y=2*0.53Y=1Y=1/3
4x/7:2/3=4:77×4x/7=4×2/34x=8/3x=2/3
(1/2x-9):1/2x=5:8(1/2x-9-1/2x)/(1/2x)=(5-8)/8-18/x=-3/8x=48
由题得,4x=3y①3×(30+x)/3×(50+y)=(90+3x)/(150+3y)=5/7②①代入②中得(90+3x)/(150+4x)=5/7解得x=120∴y=160
如果x等于7分之5y,那么x比y等于(5)比(7).再问:甲数的25%与乙数的75%相等,甲乙数的比是多少再答:甲数的25%与乙数的75%相等,甲乙数的比是3:1
9/16:x=3/16x=9/16÷3/16x=3
x:y=15:27=5:9y:z=15/4*(7/20)=21:169与21的最小公倍数为63,则x:y=35:63y:z=63:48x:y:z=35:63:48
1/3÷1/2=x/0.01解得:2/3=x/0.010.02=3xx=1/150祝学习有成!
(x-5):3=0.8:0.6则0.6(x-5)=3*0.8则x-5=4则x=9
(X/2-9):(X/2+9)=5:88(X/2-9)=5(X/2+9)4X-72=5X/2+453X/2=117X=78
18:x=3:118x1=3xx=6
X=400,Y=700.
比号用.6.10=15.*6*=15乘10*=6分只15乘10*=25
x/(4/5)=1/3x=1/3×4/5x=4/15再问:���qq����
∵x比y比Z=2比5比7∴可设x=2k,y=5k,z=7k,k≠0∴2x+2y+z分之3x+4y-2z=(3×2k+4×5k-2×7k)/(2×2k+2×5k+7k)=(12k)/(21k)=4/7
20:x=1.25x=20÷1.25x=16
25分之6
x/45+x/30=42x/90+3x/90=45x/90=45x=360x=72