X²+2X-3,=0 ,-M²+4=-3M ,3/2A²-A-1/4 ,8Y²-2Y-15=0
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![X²+2X-3,=0 ,-M²+4=-3M ,3/2A²-A-1/4 ,8Y²-2Y-15=0](/uploads/image/z/2002711-31-1.jpg?t=X%26%23178%3B%EF%BC%8B2X%EF%BC%8D3%2C%EF%BC%9D0+%2C-M%26%23178%3B%2B4%3D-3M+%2C3%EF%BC%8F2A%26%23178%3B%EF%BC%8DA%EF%BC%8D1%EF%BC%8F4+%2C8Y%26%23178%3B%EF%BC%8D2Y%EF%BC%8D15%EF%BC%9D0)
X²+2X-3,=0 ,-M²+4=-3M ,3/2A²-A-1/4 ,8Y²-2Y-15=0
X²+2X-3,=0 ,-M²+4=-3M ,3/2A²-A-1/4 ,8Y²-2Y-15=0
X²+2X-3,=0 ,-M²+4=-3M ,3/2A²-A-1/4 ,8Y²-2Y-15=0
(1)x²+2x-3=0
(x-1)(x+3)=0
x-1=0
x=1
x+3=0
x=-3
方程的解是x1=1 x2=-3
(2)-m²+4=-3m
m²-3m+4=0
(m+1)(m-4)=0
m+1=0
m=-1
m-4=0
m=4
方程的解是m1=-1 m2=4
(3)本题没有等号,不能解
(4)=√8y²-2y-15=0
(2y-3)(4y+5)=0
2y-3=0
2y=3
y=3/2
4y+5=0
4y=-5
y=-5/4
方程的解是 y1=3/2 y2=-5/4
X²+2X-3,=0
△=4+12=16
x=1土4
x1=5 x2=-3
-M²+4=-3M
M ^2-3M-4=0
(M-4)(M+1)=0
M1=4 M2=-1
8Y²-2Y-15=0
Y^2-Y/4=15/4
(Y-1/8)^2=241/64
Y-1/8=土√241/8
Y1=1/8+√241/8 Y2=1/8-√241/8