人教版(九年级上)数学书 习题22.2 答案是43页的第10和11题

\u3010\u5404\u4f4d\u5927\u795e\u901f\u5ea6~~~\u3011\u4eba\u6559\u7248\u4e5d\u5e74\u7ea7\u4e0a\u518c\u6570\u5b66 22.2.4 \u4e60\u989822.2\u7684\u7b2c43\u9875\u7684\u7b2c6\u30017\u9898\u7b54\u6848..

\u3010\u7528\u56e0\u5f0f\u5206\u89e3\u6cd5\u89e3\u4e0b\u5217\u65b9\u7a0b\u3011\uff1a
(1) 3X²-12X=-12\uff1b
x²-4x=-4
x²-4x+4=0
\uff08x-2\uff09²=0
x=2
(2) 4X²-144=0\uff1b
x²-36=0
\uff08x-6\uff09\uff08x+6\uff09=0
x=6\u6216-6
(3) 3X(X-1)=2(X-1)\uff1b
\uff083x-2\uff09\uff08x-1\uff09=0
x=2/3\u62161
(4) (2X-1)²=(3-X)²
\uff082x-1\uff09²-\uff083-x\uff09²=0
\uff082x-1-\uff083-x\uff09\uff09\uff082x-1+3-x\uff09=0
\uff083x-4\uff09\uff08x+2\uff09=0
x=4/3\u6216-2
\u3010\u6c42\u4e0b\u5217\u65b9\u7a0b\u4e24\u6839\u7684\u548c\u4e0e\u79ef\u3011\uff1a
(1) X²-3X+2=10\uff1b
x²-3x-8=0
\u25b3>0
\u548c\u662f3\uff0c\u79ef\u662f-8
(2) 5X²+X-5=0\uff1b
\u25b3>0

x²+1/5x-1=0
\u548c\u662f-1/5\uff0c\u79ef\u662f-1
(3) X²+X=5X+6\uff1b
x²-4x-6=0
\u25b3>0
\u548c\u662f4\uff0c\u79ef\u662f-6
(4) 7X²-5=X+8
7x²-x-13=0
x²-1/7x-13/7=0
\u25b3>0
\u548c\u662f1/7\uff0c\u79ef\u662f-13/7

x^-6x+9=(5-2x)^
(x-3)^=(5-2x)^
(x-3)^-(5-2x)^=0
(x-3-5+x)(x-3+5-2x)=0
(3x-8)(2-x)=0
3x-8=0 2-x=0
x1=8/3 x2=2

x^-6x+9=(5-2x)^
derte=b^-4ac
=196-192=4>0
方程有两个不同的实数根
x=-b加减根号b^-4ac
x1=8/3 x2=2

九年级上册语文第11课课后作业第四题答案。急求。

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