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学校八 年 级 班数学作业本: : 改错题:(指出错在哪里写出错的步骤)改错题:(指出错在哪里写出
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参考答案第1章 平行线【1.1】1.∠4∠4∠2∠5 2.213BC 3.C4.∠2与∠3相等∠3与∠5互补.理由略5.同位角是∠BFD 和∠DEC同旁内角是∠AFD 和∠AED6.各4对.同位角有∠B 与∠GAD∠B 与∠DCF∠D 与∠HAB∠D 与∠ECB内错角有∠B 与∠BCE∠B 与∠HAB∠D 与∠GAD∠D 与∠DCF同旁内角有∠B 与∠DAB∠B 与∠DCB∠D 与∠DAB∠D
1. 判断下面各题的叙述是否正确(l)a2>2a( )(2)含有未知数的式子叫做方程( )(3)5x5=5(x1)( )(4)x=6是方程3x-6=12的解( )2.解下列方程x= =14 = 42x25x== x÷3= 2x-97= 13(x5)=1693. 4.太阳系的八大行星中离太阳最近的是水星地球
八年级第19周数学作业(一)班级________座号_________________成绩_____________课任教师签名_________家长签名_____________一计算:(每小题3分)解1 eq oac(○1) 107 ×104 eq oac(○2) x2 · x5 eq oac(○3) 23×24×25 eq oac(○4) y · y2
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