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> 计算.①(-2)3+6÷(-12)-1-(-3.5)0②a•a2•a3+(-2a3)2-a7÷a③(x+2)2-(x-1)(x-2)④(m-2n+3)(m+2n-3)-数学
计算.①(-2)3+6÷(-12)-1-(-3.5)0②a•a2•a3+(-2a3)2-a7÷a③(x+2)2-(x-1)(x-2)④(m-2n+3)(m+2n-3)-数学
题目简介
计算.①(-2)3+6÷(-12)-1-(-3.5)0②a•a2•a3+(-2a3)2-a7÷a③(x+2)2-(x-1)(x-2)④(m-2n+3)(m+2n-3)-数学
题目详情
计算.
①
(-2
)
3
+6÷(-
1
2
)
-1
-(-3.5
)
0
②a•a
2
•a
3
+(-2a
3
)
2
-a
7
÷a
③(x+2)
2
-(x-1)(x-2)
④(m-2n+3)(m+2n-3)
题型:解答题
难度:中档
来源:不详
答案
①原式=-8+6÷(-2)-1=-8-3-1=-12;
②原式=a6+4a6-a6=4a6;
③原式=x2+4x+4-(x2-3x+2)=x2+4x+4-x2+3x-2=7x+2;
④原式=m2-(2n-3)2=m2-(4n2-12n+9)=m2-4n2+12n-9.
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题目简介
计算.①(-2)3+6÷(-12)-1-(-3.5)0②a•a2•a3+(-2a3)2-a7÷a③(x+2)2-(x-1)(x-2)④(m-2n+3)(m+2n-3)-数学
题目详情
①(-2)3+6÷(-
②a•a2•a3+(-2a3)2-a7÷a
③(x+2)2-(x-1)(x-2)
④(m-2n+3)(m+2n-3)
答案
②原式=a6+4a6-a6=4a6;
③原式=x2+4x+4-(x2-3x+2)=x2+4x+4-x2+3x-2=7x+2;
④原式=m2-(2n-3)2=m2-(4n2-12n+9)=m2-4n2+12n-9.