本课配套习题挑战模式1/5
单选题
难度系数:
1.下列计算正确的是( )
A: a2+a2=a4 |
B: 2a-a=2 |
C:(ab)2=a2b2 |
D:(a2)3=a5 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruWQiOW5tuWQjOexu+mhueeahOazleWIme+8jOWQjOW6leaVsOW5gueahOS5mOazleS7peWPiuW5gueahOS5mOaWueeahOefpeivhuaxguino+WNs+WPr+axguW+l+etlOahiC4=
- 答案:Qw==
6Kej77yaQeOAgWE8c3VwPjI8L3N1cD4rYTxzdXA+Mjwvc3VwPj0yYTxzdXA+Mjwvc3VwPu+8jOaVheacrOmAiemhuemUmeivr++8mzxicj5C44CBMmEtYT1h77yM5pWF5pys6YCJ6aG56ZSZ6K+v77ybPGJyPkPjgIHvvIhhYu+8iTxzdXA+Mjwvc3VwPj1hPHN1cD4yPC9zdXA+YjxzdXA+Mjwvc3VwPu+8jOaVheacrOmAiemhueato+ehru+8mzxicj5E44CB77yIYTxzdXA+Mjwvc3VwPu+8iTxzdXA+Mzwvc3VwPj1hPHN1cD42PC9zdXA+77yM5pWF5pys6YCJ6aG56ZSZ6K+v77ybPGJyPuaVhemAie+8mkMuIA==
本课配套习题挑战模式2/5
单选题
难度系数:
2.下列说法中,正确的是()
A: -an和(-a)n一定不相等 |
B: -an和(-a)n一定互为相反数 |
C: 当n为奇数时,-an和(-a)n相等 |
D: 当n为偶数时,-an和(-a)n相等 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruW5gueahOS5mOaWueS4juenr+eahOS5mOaWuei/kOeul+azleWIme+8jOe7k+WQiOWQhOmAiemhuei/m+ihjOWIpOaWreWNs+WPry4=
- 答案:Qw==
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
本课配套习题挑战模式3/5
单选题
难度系数:
3.下面是某同学在一次测验中的计算:①3a+2b=5ab,②4m2n-5mn3=-m3n,③3x3(-2x2)=-6x5,④4a3b÷(-2a2b)=-2a,⑤(a3)2=a5,⑥(-a)3(-a)=-a2,其中正确的个数是( )
A: 1个 |
B: 2个 |
C: 3个 |
D:4个 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruWQiOW5tuWQjOexu+mhueeahOazleWIme+8jOWNlemhueW8j+S5mOWNlemhueW8j+eahOazleWIme+8jOWNlemhueW8j+mZpOWNlemhueW8j+eahOazleWIme+8jOW5gueahOS5mOaWueeahOaAp+i0qO+8jOWQjOW6leaVsOW5gueahOS5mOazleeahOaAp+i0qO+8jOWvueWQhOmAiemhueiuoeeul+WQjuWIqeeUqOaOkumZpOazleaxguinoy4=
- 答案:Qg==
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
本课配套习题挑战模式4/5
单选题
难度系数:
4.下列运算中,正确的是()
A: 2ac(5b2+3c)=10b2c+6ac2 |
B: (a-b)2(a-b+1)=(a-b)3-(b-a)2 |
C: (b+c-a)(x+y+1)=x(b+c-a)-y(a-b-c)-a+b-c |
D: (a-2b)(11b-2a)=(a-2b)(3a+b)-5(2b-a)2 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOagueaNruWkmumhueW8j+S5mOS7peWkmumhueW8j+eahOazleWImS4g5aSa6aG55byP5LiO5aSa6aG55byP55u45LmY77yM5YWI55So5LiA5Liq5aSa6aG55byP55qE5q+P5LiA6aG55LmY5Y+m5aSW5LiA5Liq5aSa6aG55byP55qE5q+P5LiA6aG577yM5YaN5oqK5omA5b6X55qE56ev55u45YqgLg==
- 答案:RA==
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
本课配套习题挑战模式5/5
单选题
难度系数:
5.下列式子中不成立的有()
(1)(x-y)2=(y-x)2
(2)(x+y)(x-y)=(-x-y)(y-x)
(3)(a-2b)3(2b-a)=(a-2b)2(2b-a)2;
(4)(x-2)(x2-2x+4)=x3-8
(5)(x-y)2=(x+y)2-4xy
(1)(x-y)2=(y-x)2
(2)(x+y)(x-y)=(-x-y)(y-x)
(3)(a-2b)3(2b-a)=(a-2b)2(2b-a)2;
(4)(x-2)(x2-2x+4)=x3-8
(5)(x-y)2=(x+y)2-4xy
A: 1个 |
B: 2个 |
C: 3个 |
D: 4个 |
一次做对,真牛!
+5奖励规则>
- 提示1:IOWwhumimOS4reetieW8j+etieWPt+W3pui+ueeahOaVtOW8j+i/kOeul++8jOeci+aYr+WQpuetieS6juetieWPt+WPs+i+ueeahOaVtOW8jy4=
- 答案:Qg==
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