数学方程一道,求学霸帮忙解答,必采纳!!!
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15x-12=4x+10-3x+6
15x-4x+3x=12+10+6
14x=28
x=2
\u2235x-2\u22600
\u2234x\u22602
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2(y²+4y+4)-9=0
2(y+2)²=9
(y+2)²=二分之九
y+2=二分之三倍根号二或负二分之三倍根号二
6=2+二分之三倍根号二或2-二分之三倍根号二
不懂可以追问,望采纳
方程两边同时除以2得:y2+4y﹣=0,
移项得:y2+4y=,
左右两边加上4,变形得:(y+2)2=,
开方得:y+2=±,
∴y1=﹣2+,y2=﹣2﹣.
求采纳,欢迎追问
2y²+8y-1=0
2(y²+4y+4)-8-1=0
2(y+2)²=9
下面你就会了吧
2y.2y+8y一1=0
绛旓細鍥
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绛旓細鍥炵瓟锛氱涓棰榵=2/9*4/3=8/27
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绛旓細鍥炵瓟锛1銆亁=11/30 2銆亁=0.6
绛旓細(1)b²-4ac =(m-3)²-4(-m²)=m²-6m+9+4m²=5m²-6m+9 =5(m-3/5)²+36/5>0 鎵浠ユ湁涓や釜涓嶇浉绛夌殑瀹炴暟鏍 (2)x1+x2=m-3 x1x2=-m²<0 鎵浠1x2涓涓ぇ浜0锛屼竴涓皬浜0 璁緓1>0 x2<0 |x1|=|x2|-2 x1=-x2-2 x1+x...
绛旓細瑙o細锛1锛夆埖f锛坸锛=锛1+x锛塼-1 鈭磃'锛坸锛=t锛1+x锛墄-1锛屸埓f'锛0锛=t锛屽張f锛0锛=0锛屸埓l鐨鏂圭▼涓猴細y=tx 锛2锛変护h锛坸锛=f锛坸锛-g锛坸锛=锛1+x锛塼-tx-1h'锛坸锛=t锛1+x锛塼-1-t=t[锛1+x锛塼-1-1]褰搕锛0鏃讹紝锛1+x锛塼-1-1鍗曡皟閫掑噺锛屽綋x=0鏃讹紝h'锛坸锛=0 ...
绛旓細鍥炵瓟锛50X0.8(X+1)=50xX90% 40X(x+1)=45x 40x+40=45x 40x-45x=-40 5x=40 x=8
绛旓細鍥炵瓟锛鏂圭▼涓よ竟鍚屾椂闄や互2寰:y2+4y锕=0, 绉婚」寰:y2+4y=, 宸﹀彸涓よ竟鍔犱笂4,鍙樺舰寰:(y+2)2=, 寮鏂瑰緱:y+2=卤, 鈭磞1=锕2+,y2=锕2锕.