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计算:①解方程﹣=1;②()﹣1﹣(3.14﹣π)0+0.254×44.
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教案备课库《2012-2013学年湖北省武汉二中、七一中学八年级(下)期末数学试卷》真题及答案
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解方程﹣=1.
解方程
1计算2解方程
解方程
解方程
解方程.
解方程.
解方程.
我们知道解二元一次方程组的基本思想方法是消元那么解方程组宜用______法解方程组宜用______法
解方程
解方程.
下列解方程的过程中正确的是
x
2
=-2,解方程,得x=±
(x-2)
2
=4,解方程,得x-2=2,x=4
4(x-1)
2
=9,解方程,得4(x-1)=±3,x
1
=
,x
2
=
(2x+3)
2
=25,解方程,得2x+3=±5,x
1
=1,x
2
=-4
理解同解方程的定义再解题1同解方程的定义为如果两个方程的解相同那么这两个方程叫同解方程反之如果两个方
解方程﹣1=
解方程+=1.
用配方法解方程2xx-1=5x-1的方程的根为.
x =
x = 1
x
1
=
, x
2
= 1
x
1
=
, x
2
= 1
计算||+π﹣30+﹣1﹣2cos45°.
解方程﹣1=
解方程-=3
解方程与化简 1解方程 2当x=﹣2求分式的值.
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