2X1/4怎么画图
这就需要用到概念的问题,二分之一乘四分之一的式子。参考如下:
绛旓細鐢电嚎涓婃爣璇嗙殑2x1,o锛屾槸杩欐牴鐢电嚎鐨勮鏍硷紝瀹屾暣涔﹀啓鏄2*1.0mm²琛ㄧず鐨勬槸杩欐牴鐢电嚎鏄2鑺數缂嗭紝姣忚姱鐨勬í鎴潰绉ぇ灏忔槸1.0骞虫柟姣背
绛旓細杩欐槸涓涓満姊伴浂浠,鏄竴涓┖鍒妲(涔熷彨鐮傝疆瓒婄▼妲),妲藉2姣背,娣1姣背.
绛旓細涔2鍦烘瘮璧涳紝蹇呴』寰椾拱瀵
绛旓細2x1x2鐨勬爣鍑嗗舰閰嶆柟娉曪細2X1X2= 2(y1+y2)(y1-y2) -2 (y3+y4)(y3-y4)= 2y1^2-2y2^2-2y3^2+2y4^2銆俧=2x1x2-2x1x3-6x2x3 = 2(y1+y2)(y1-y2)-2(y1+y2)y3-6(y1-y2)y3 = 2y1^2 - 8y1y3 - 2y2^2 + 4y2y3 = 2z1^2-2z2^2-6z3^2 鍚箟 鍚湁绛夊彿...
绛旓細绛旓細x1婊¤冻锛2x+2^x=5锛2x1+2^(x1)=5 x2婊¤冻锛2x+2log2(x-1)=5锛2x2+2log2(x2-1)=5 璁総=log2(x2-1)鍒檟2-1=2^t 鎵浠ワ細x2=1+2^t 鎵浠ワ細2(1+2^t)+2t=5 鎵浠ワ細2(t+1)+2^(t+1)=5 鎵浠ワ細x1鍜宼+1閮芥槸鏂圭▼2x+2^x=5鐨勮В 鎵浠ワ細x1=t+1=log2(x2-1)+1...
绛旓細瑙e師鏂圭▼x1+x2=-3/2 x1x2=-1/2 鎵浠ユ柊鏂圭▼x1+x2=2(-3/2)=-3 x1x2=2x1=-1 鎵浠ユ柊鏂圭▼涓篨^2+3X-1=0 绗2 X1+X2=-3/2-2=-7/2 ( X1-1)(X2-1)=X1X2-(X1+X2)+1=-1-(--3/2)+1=3/2鎵浠ユ柊鏂圭▼涓簒^2+7/2X+3/2鍖栫畝寰2X^2+7X+3=0 绗3 鍘熸柟绋嬩袱鏍瑰拰鐨...
绛旓細2x+1鈮0 x鈮-0.5 浠诲彇x2>x1鈮-0.5 f(x2)-f(x1)=鈭(2x2+1)-鈭(2x1+1)=2(x2-x1)/[鈭(2x2+1)+鈭(2x1+1)]鈭祒2>x1鈮-0.5 鈭磝2-x1>0,鈭(2x2+1)+鈭(2x1+1)>0 f(x2)-f(x1)>0 f(x2)>f(x1)鍥犳锛屽嚱鏁板湪瀹氫箟鍩熷唴鍗曡皟閫掑銆
绛旓細x²+x-12=0锛宎=1锛宐=1锛宑=-12 x={-1卤鈭歔1²-4x1x(-12)]/(2x1)={-1卤鈭歔1+48]/2 ={-1卤鈭49}/2 ={-1卤7}/2 x1=(-1+7)/2 =6/2 =3 x2=(-1-7)/2 =-8/2 =-4 x²-²鈭2x-1/4=0锛²鈭2x鏄粈涔堟剰鎬濓紵x²+4x+8=2x...
绛旓細x1鐨勫钩鏂瑰噺x1鍔爔2鐨勫肩瓑浜3銆傗埖x1鏄柟绋嬬殑涓涓牴 鈭磝1² - 2x1 - 1=0 x1² - x1 - x1 - 1=0 鍒檟1² - x1=1 + x1 鏍规嵁闊﹁揪瀹氱悊锛歺1 + x2=2 鈭村師寮=1 + x1 + x2=1+2=3
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