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解方程x2﹣3x+1=0.
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教案备课库《2017-2018学年云南省昆明市盘龙区九年级(上)期末数学试卷》真题及答案
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解方程-2x-5+3x-1=0时去括号正确的是
-2x-10+3x-3=0
-2x+10+3x-1=0
-2x+10+3x-3=0
-2x+5+3x-3=0
解方程x2-3x+5+6x2-3x=0
响应变量Y与两个自变量原始数据X1及X2建立的回归方程为y=2.2+30000x1+0.0003x2
X1对Y的影响比X2对Y的影响要显著得多
X1对Y的影响比X2对Y的影响相同
X2对Y的影响比X1对Y的影响要显著得多
仅由此方程不能对X1及X2对Y影响大小作出判定
解方程x2x﹣3=3﹣2x.
解方程3xx-2=x-2
已知二次型 的秩为2. Ⅰ求a的值 Ⅱ求正交变换x=Qy把fx1x2x3化成标准形 Ⅲ求方程fx1
解方程3xx﹣2=22﹣x
如果方程lg2x+lg2+lg3lgx+lg2·lg3=0的两根为x1x2那么x1·x2的值为
lg2·lg3
lg2+lg3
-6
解方程2x﹣3=3xx﹣3.
已知一元二次方程2x2﹣6x﹣1=0的两实数根为x1x2不解方程求代数式的值.
我们规定若关于x的一元一次方程ax=b的解为b﹣a则称该方程为差解方程例如2x=4的解为2且2=4﹣
响应变量Y与两个自变量原始数据X1及X2建立的回归方程为:y=5.0+10000x1+0.0007x
X1对Y的影响比X2对Y的影响要显着得多
X1对Y的影响比X2对Y的影响相同
X2对Y的影响比X1对Y的影响要显着得多
仅由此方程不能对X1及X2对Y影响大小作出判定
解方程10+4x﹣3=2x﹣1.
响应变量Y与两个自变量原始数据X1及X2建立的回归方程为Y=2.1X1+2.3X2由此方程可以得到结
X1对Y的影响比X2对Y的影响要显著得多
X1对Y的影响比X2对Y的影响相同
X2对Y的影响比X1对Y的影响要显著得多
仅由此方程不能对X1及X2对Y影响大小作出判定
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
一元二次方程x2=2x的根是
x=2
x=0
x1=0, x2=2
x1=0, x2=-2
我们规定若关于x的一元一次方程ax=b的解为b+a则称该方程为和解方程.例如方程2x=-4的解为x
解方程x2+4x−2=0
解方程x2-3x-10=0
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