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解方程:2x2+3x=0.
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教案备课库《初二年级(下)数学大练习(11)》真题及答案
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阅读下面的例题解方程x2-∣x∣-2=0解当x≥0王时原方程化为x2-x-2=0解得x1=2x2=-
解方程xx-2+x-2=0
解方程x2+4x―2=0
阅读下列例题解方程x2﹣|x|﹣2=0解1当x≥0时原方程化为x2﹣x﹣2=0解得x1=2x2=﹣1
解方程x2-3x+5+6x2-3x=0
解方程x2-x-3=0
解方程x2-4x-2=0
解方程x2﹣2x=0
解方程xx﹣2+x﹣2=0.
阅读例题请参照例题的方法解方程x2﹣|x﹣1|﹣1=0解方程x2﹣|x|﹣2=0解1当x≥0时得x2
阅读下面的例题解方程x﹣12﹣5|x﹣1|﹣6=0例解方程x2﹣|x|﹣2=0解令y=|x|原方程化
解方程x2+4x-2=0
解方程2x+12﹣xx﹣2=0.
解方程x-12+2xx-1=0
解方程x²-2x-3=0
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
阅读下面的例题范例解方程x2﹣|x|﹣2=0解1当x≥0时原方程化为x2﹣x﹣2=0解得x1=2x2
用配方法解方程x2+8x-7=0则配方正确的是
(x+4)
2
=23
(x﹣4)
2
=23
(x﹣8)
2
=49
(x+8)
2
=64
.阅读下面的例题解方程x﹣12﹣5|x﹣1|﹣6=0解方程x2﹣|x|﹣2=0解原方程化为|x|2﹣
.阅读下面的例题解方程x2﹣|x|﹣2=0解1当x≥0原方程化为x2﹣x﹣2=0解得x1=2x2=﹣
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