(5y+1)÷6=(9y+1)÷8-(1-y)÷3
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(5y+1)÷6=(9y+1)÷8-(1-y)÷3
(5y+1)÷6=(9y+1)÷8-(1-y)÷3
(5y+1)÷6=(9y+1)÷8-(1-y)÷3
(5y+1)÷6=(9y+1)÷8-(1-y)÷3
去分母,得
4(5y+1)=3(9y+1)-8(1-y)
去括号,得
20y+4=27y+3-8+8y
移项,得
20y-27y-8y=3-8-4
合并同类项,得
-15y=-9
化系数为1,得
y=3/5
(5y+1)÷6=(9y+1)÷8-(1-y)÷3
y (3y^2+8y-3)-6y(3y+2y-1)+9y
[T,Y]=ode45(@rigid,[0 1],[rand(15,1)]);plot(T,Y(:,1),'-',T,Y(:,2),'-.',T,Y(:,3),'.',T,Y(:,4),'-',T,Y(:,5),'-.',T,Y(:,6),'.',T,Y(:,7),'-',T,Y(:,8),'-.',T,Y(:,9),'.',T,Y(:,10),'-',T,Y(:,11),'-.',T,Y(:,12),'-.',T,Y(:,13),'.',T,Y(:,14),'-',T,Y(:,15),'.')
计算.2x÷x/5x+3y^2-4y+4/2y-6·1/y+3÷12-6y/9-y^2
(y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值.
[-(xy)/(x-y)²]^4*(y²-xy/x)³*x^4/y^10÷(x/xy-y²)^5,y=-1就是(y²-xy)³(xy-y²)^5/(x-y)^8*y^6,就是y³,y=-1
(x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3
先化简,再求值[(2x+y)^2-(2x+y)(2x-y)-y(5x+y)]÷(1/2y),其中x-y=2
5y-4÷2y-4+1÷2=2y+5÷(3y-6)解方程
(3y-1)/4-1=(5y-7)/6 9y-3-3=10y-14 9y-10y=-14+3+3 -y=-8 y=8
已知(1/x)-(1/y)=5,求(6x+7xy-6y)/(8y-9xy-8y)
5y+1/6=9y+1/8-1-y/3
(5Y+1)/6=(9Y+1)/8-(1-Y)/3
解一元一次方程5y+1/6 = 9y+1/8 - 1-y/3
y- 2y+1/2=9- 8-y/4
y-2y+1/2=9-8-y/4
y''-5y'+6y=3x+1通解
通分 y+3/y*y-6y+9,1/2y+6,y-1/y*y-9