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(1)下列计算中，正确的是 (
A.$x^{8}÷ x^{4}=x^{8-4}=x^{4}$
B.$10^{-2}=-20$
C.$(-\dfrac{1}{5})^{0}=0$
D.$(-m)^{4}÷(-m)^{2}=-m^{2}$
A
)A.$x^{8}÷ x^{4}=x^{8-4}=x^{4}$
B.$10^{-2}=-20$
C.$(-\dfrac{1}{5})^{0}=0$
D.$(-m)^{4}÷(-m)^{2}=-m^{2}$
答案
(1)A
(2)下列计算中，结果为$x^{6}$的是(
A.$x÷ x^{6}$
B.$(-x)^{9}÷(-x)^{3}$
C.$x^{7}÷ x^{0}$
D.$x^{12}÷ x^{2}$
B
)A.$x÷ x^{6}$
B.$(-x)^{9}÷(-x)^{3}$
C.$x^{7}÷ x^{0}$
D.$x^{12}÷ x^{2}$
答案
(2)B
(3)计算$2^{0}÷2^{-3}$的结果是 (
A.$-\dfrac{1}{8}$
B.$\dfrac{1}{8}$
C.0
D.8
D
)A.$-\dfrac{1}{8}$
B.$\dfrac{1}{8}$
C.0
D.8
答案
(3)D
(4)下列计算中，正确的是 (
A.$(-5)^{0}=0$
B.$x^{2}+x^{3}=x^{5}$
C.$(ab^{2})^{3}=a^{2}b^{5}$
D.$2a^{2}· a^{-1}=2a$
D
)A.$(-5)^{0}=0$
B.$x^{2}+x^{3}=x^{5}$
C.$(ab^{2})^{3}=a^{2}b^{5}$
D.$2a^{2}· a^{-1}=2a$
答案
(4)D
(5)下列计算中，正确的是 (
A.$3x+5y=8xy$
B.$x^{3}· x^{5}=x^{8}$
C.$x^{6}÷ x^{3}=x^{2}$
D.$(-x^{3})^{3}=x^{6}$
B
)A.$3x+5y=8xy$
B.$x^{3}· x^{5}=x^{8}$
C.$x^{6}÷ x^{3}=x^{2}$
D.$(-x^{3})^{3}=x^{6}$
答案
(5)B
(1)$10^{5}÷10^{2}=$
$10^{3}$
.答案
(1)$10^{3}$
(2)$(-3)^{6}÷(-3)^{4}=$
9
.答案
(2)9
(3)$a^{9}÷ a^{3}=$
$a^{6}$
.答案
(3)$a^{6}$
(4)$(\dfrac{1}{2})^{4}÷(\dfrac{1}{2})^{6}=$
4
.答案
(4)4
(5)$(x-y)^{6}÷(y-x)^{3}÷(x-y)=$
$-(x-y)^{2}$
.答案
(5)$-(x-y)^{2}$
(6)若m，n满足$|m-3|+(n-2023)^{2}=0$，则$m^{-1}+n^{0}=$
$\frac{4}{3}$
.答案
(6)$\frac{4}{3}$
3. 计算.
(1)$(-a)^{7}÷(-a)^{2};$
(2)$(ab)^{n-2}÷(ab)^{m-2};$
(3)$(-x)^{7}÷(-x)^{3}÷(-x)^{2};$
(4)$(-x^{3})^{3}÷(x^{2})^{5};$
(5)$(-2m^{2})^{3}+m^{7}÷ m;$
(6)$-1^{2024}-(\dfrac{1}{2})^{-1}+(-5)^{0};$
(7)$|-2|+(π-3)^{0}+(\dfrac{1}{3})^{-2}.$
(1)$(-a)^{7}÷(-a)^{2};$
(2)$(ab)^{n-2}÷(ab)^{m-2};$
(3)$(-x)^{7}÷(-x)^{3}÷(-x)^{2};$
(4)$(-x^{3})^{3}÷(x^{2})^{5};$
(5)$(-2m^{2})^{3}+m^{7}÷ m;$
(6)$-1^{2024}-(\dfrac{1}{2})^{-1}+(-5)^{0};$
(7)$|-2|+(π-3)^{0}+(\dfrac{1}{3})^{-2}.$
答案
(1)$-a^{5}$ (2)$(ab)^{n-m}$ (3)$x^{2}$ (4)$-\frac{1}{x}$
(5)$-7m^{6}$ (6)$-2$ (7)12
(5)$-7m^{6}$ (6)$-2$ (7)12
