-7分之3y=8-y(解方程)
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(2/3)x+(3/4)y=1/2(1)x12得8x+9y=6(3)(4/5)x+(5/6)y=7/15(2)x30得24x25y=14(4)把(3)x3得24x+27y=18(5)把(4)-(5)得
y=5/3则2y-1/2y=10/3-5/6=5/2而5/2-1/2=2所以右边是1/2加上2
(1-3y)/3-2y=3-(y+2)/4,去分母得4(1-3y)-24y=36-3(y+2)4-12y-24y=36-3y-6-33y=26,y=-26/33
再问:用代入法
3y-(3y+5)/6=(1+2y)/2-(5y-4)/4,两边都乘以12,得36y-2(3y+5)=6(1+2y)-3(5y-4),36y-6y-10=6+12y-15y+12,33y=28,y=2
3Y/7=-1/3(7/3)*(3Y/7)-=(7/3)*(-1/3)Y=-7/9
3分之5y+4+4分之y-1=12分之5y-5两边乘124(5y+4)+3(y-1)=5y-520y+16+3y-3=5y-523y-5y=-5-1318y=-18y=-1再问:抱歉,打错了,是3分之
y/5-y/2-1=2-y/5+2y/5-y/2+y/5=2+2+12y/10-5y/10+2y/10=5y=-50再问:看不懂
两边乘以12得9y+21-12=10y+10-y=1∴y=-1
3y-15=y-192y=-4y=-24分之y+2-6分之2y-3=13y+6-4y+6=12-y=0∴y=016分之x=8分之4x+5+2x=8x+10+32-7x=42x=-6
(1)2x+1/6x=39/413/6x=39/4x=9/2(2)7/8x-2/7=3/47/8x=3/4+2/7=21/28+8/28=29/28x=58/49(3)3/4y-3/5y=3/1015
11y-12-2y²=y²-7y+10-(3y²-7)18y=12+10+7=39y=39/18
4分之(2x+3y)+4分之(2x-3y)=7(1)3分之(2x+3y)-2分之(2x-3y)=8(2)分子分母是这样的吧,由(1)得,2x+3y+2x-3y=284x=28x=7由(2)得,2(2x
x=9+1/2y代入第二个方程:1/3×(9+1/2y)-1/2y=63+1/6y-1/2y=6-1/3y=6-31/3y=3y=9x=9+1/2×9=13.5很高兴为您解答,【学习宝典】团队为您答题
(3Y-5)/(3Y-6)=(1+2Y-5Y/4-4)/24*(3Y-5)/4(3Y-6)=4*(1+2Y-5Y/4-4)/2*4(12Y-20)/(12Y-24)=(3Y-12)/896Y-160=
(y+4)/5+y+6=(y+8)/2-(y+4)/3乘以30得6(y+4)+30y+180=15(y+8)-10(y+4)6y+24+30y+180=15y+120-10y-406y+30y-15y
两边乘122y+6+12=6y-96y-2y=6+12+94y=27y=27/4
x/2-y/3=1简化:3x-2y=6①x+2y=2②①+②3x+x=6+24x=8x=22+2y=22y=0y=0即:方程组的解为x=2;y=0
再问:这样带回原式是错的啊再答:
3y-6分之3y+5=2y-4分之5y-4方程两边同时乘以6(y-2),得2(3y+5)=3(5y-4)则6y+10=15y-12,解得y=22/9检验:将y=22/9代入原方程,左边=右边所以y=2