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(1)计算$(-x^{2}y)^{2}$的结果是 (
A.$x^{4}y^{2}$
B.$-x^{4}y^{2}$
C.$x^{2}y^{2}$
D.$-x^{2}y^{2}$
A
)A.$x^{4}y^{2}$
B.$-x^{4}y^{2}$
C.$x^{2}y^{2}$
D.$-x^{2}y^{2}$
答案
(1)A
(2)下列计算中，不正确的是 (
A.$(2mn)^{2}=4m^{2}n^{2}$
B.$(-2mn)^{2}=4m^{2}n^{2}$
C.$(2m^{2}n^{2})^{3}=8m^{6}n^{6}$
D.$(-2m^{2}n^{2})^{3}=-8m^{5}n^{5}$
D
)A.$(2mn)^{2}=4m^{2}n^{2}$
B.$(-2mn)^{2}=4m^{2}n^{2}$
C.$(2m^{2}n^{2})^{3}=8m^{6}n^{6}$
D.$(-2m^{2}n^{2})^{3}=-8m^{5}n^{5}$
答案
(2)D
(3)计算$a· a^{5}-(2a^{3})^{2}$的结果是(
A.$a^{6}-2a^{5}$
B.$-a^{6}$
C.$a^{6}-4a^{5}$
D.$-3a^{6}$
D
)A.$a^{6}-2a^{5}$
B.$-a^{6}$
C.$a^{6}-4a^{5}$
D.$-3a^{6}$
答案
(3)D
(4)若$(a^{m}b^{n}b)^{3}=a^{9}b^{15}$，则m，n的值分别为 (
A.-4，9
B.4，3
C.3，4
D.6，9
C
)A.-4，9
B.4，3
C.3，4
D.6，9
答案
(4)C
(5)计算$0.75^{6}×(-\frac {4}{3})^{6}$的结果是 (
A.0
B.1
C.-5
D.$\frac{1}{64}$
B
)A.0
B.1
C.-5
D.$\frac{1}{64}$
答案
(5)B
(1)$(2×10^{5})^{3}=$
$8× 10^{15}$
.答案
(1)$8× 10^{15}$
(2)$(-\frac {3}{4}a^{2}b)^{2}=$
$\frac{9}{16}a^{4}b^{2}$
.答案
(2)$\frac{9}{16}a^{4}b^{2}$
(3)$(-a^{2}b)^{3}=$
$-a^{6}b^{3}$
.答案
(3)$-a^{6}b^{3}$
(4)$(-x^{3}y^{2})^{4}=$
$x^{12}y^{8}$
.答案
(4)$x^{12}y^{8}$
(5)$-(3ab^{2})^{2}=$
$-9a^{2}b^{4}$
.答案
(5)$-9a^{2}b^{4}$
3. 计算.
(1)$(-x^{3}y)^{3};$
(2)$(\frac {1}{3}a^{2}b)^{2}· a^{4};$
(3)$[-2(a-b)^{2}]^{2};$
(4)$a^{3}· a^{4}· a+(a^{2})^{4}+(-2a^{4})^{2};$
(5)$2(x^{3})^{2}· x^{3}-(3x^{3})^{3}+(5x)^{2}· x^{7}.$
(1)$(-x^{3}y)^{3};$
(2)$(\frac {1}{3}a^{2}b)^{2}· a^{4};$
(3)$[-2(a-b)^{2}]^{2};$
(4)$a^{3}· a^{4}· a+(a^{2})^{4}+(-2a^{4})^{2};$
(5)$2(x^{3})^{2}· x^{3}-(3x^{3})^{3}+(5x)^{2}· x^{7}.$
答案
3. (1)$-x^{9}y^{3}$ (2)$\frac{1}{9}a^{8}b^{2}$ (3)$4(a-b)^{4}$
(4)$6a^{8}$ (5)0
(4)$6a^{8}$ (5)0
