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解方程 12x﹣x=451; 50%x﹣1.2×12=0.6;x:0.6=:4; =;x﹣x+=.
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教案备课库《2015年黑龙江省牡丹江市穆棱市八面通镇莲河学校小升初数学模拟试卷》真题及答案
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用公式法解方程4x2﹣12x=3所得的解正确的是
x=
x=
x=
x=
分解因式﹣3x3+12x2﹣12x=.
下列是四个同学解方程2x﹣2﹣34x﹣1=9的过程其中正确的是
2x﹣4﹣12x+3=9
2x﹣4﹣12x﹣3=9
2x﹣4﹣12x+1=9
2x﹣2﹣12x+1=9
某车间有28名工人生产螺丝与螺母每人每天生产螺丝12个或螺母18个现有x名工人生产螺丝恰好每天生产的
12x =18(28-x);
2×12x =18(28-x);
2×18x =12(28-x);
12x =2×18(28-x) ;
解方程x﹣7.4=82x=3.610x﹣7.5x=3012x+3.6=8.4.
将高次方程5x5+3x4-12x3+x-9写成VB表达式为【8】
用公式法解方程3x2+4=12x下列代入公式正确的是
x
1
、
2
=
x
1
、
2
=
x
1
、
2
=
x
1
、
2
=
今年小强的爷爷66岁小强12岁x年前爷爷的年龄是小强的7倍则可列方程
12x=66
7(66-x)=12-x
66-x=7(12-x)
12x×7=66
解方程1x2+x-12=0
解方程. 4x+6x=2648﹣x=1512x﹣7×8=1242.8x÷2=7.
解方程12x﹣9x=8.73.5+10x=12.5.
微分方程y+2y’=12x2-10的通解是______.
10.00分解方程. 12x=483x+36=7894x﹣12=8x÷0.8=4.5.
解方程x﹣2x﹣3=12
解方程=x﹣时去分母得
4(x+1)=x﹣3(5x﹣1)
x+1=12x﹣(5x﹣1)
3(x+1)=12x﹣4(5x﹣1)
3(x+1)=x﹣4(5x﹣1)
解方程 5x﹣3.9=5.1 12x﹣9x=8.7.
用配方法解方程4x2+5=12x
与直线x+y﹣2=0和曲线x2+y2﹣12x﹣12y+54=0都相切的半径最小的圆的标准方程是.
解方程.12x=483x+36=7894x﹣12=8x÷0.8=4.5.
解方程112x﹣3.8x=6.4212x﹣3.8=6.4312﹣3.8x=6.4.
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在一次数学活动课上老师带领同学们去测量一座古塔CD的高度.他们首先从A处安置测倾器测得塔顶C的仰角∠CFE=21°然后往塔的方向前进50米到达B处此时测得仰角∠CGE=37°已知测倾器高1.5米请你根据以上数据计算出古塔CD的高度.参考数据sin37°≈tan37°≈sin21°≈tan21°≈
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如图24-Y-13某校数学兴趣小组为测得大厦AB的高度在大厦前的平地上选择一点C测得大厦顶端A的仰角为30°再向大厦方向前进80米到达点D处CDB三点在同一直线上又测得大厦顶端A的仰角为45°请你计算该大厦的高度.精确到0.1米参考数据≈1.414≈1.732
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在学习实践科学发展观的活动中某单位在如图所示的办公楼迎街的墙面上垂挂一长为30米的宣传条幅AE张明同学站在离办公楼的地面C处测得条幅顶端A的仰角为50°测得条幅底端E的仰角为30度.问张明同学是在离该单位办公楼水平距离多远的地方进行测量精确到整数米参考数据sin50°≈0.77cos50°≈0.64tan50°≈1.20sin30°=0.50cos30°≈0.87tan30°≈0.58
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