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

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