摘要:19.算一算
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算一算:
(1)20+(-12)-(-18)
(2)23×10+(-2)×(-5)2
(3)
÷(-
)-(
)×(-5)
(4)(-
-
+
)÷
(5)|-
|÷(
-0.2)-
×(-4)2
(6)-12008-[0.1252008×(-8)2009+(-12)÷6]2×(-
)+|-2|3.
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(1)20+(-12)-(-18)
(2)23×10+(-2)×(-5)2
(3)
8 |
3 |
8 |
9 |
2 |
5 |
(4)(-
3 |
4 |
5 |
9 |
7 |
12 |
1 |
36 |
(5)|-
7 |
9 |
2 |
3 |
1 |
3 |
(6)-12008-[0.1252008×(-8)2009+(-12)÷6]2×(-
1 |
5 |
17、算一算!千万别出错!
(1)-t(-t)2-t3;
(2)(-2a)3-(-a)•(3a)2;
(3)(3xy2)2+(-xy)•(-4xy3);
(4)(x-1)(x2+x+1);
(5)(2x+y)(2x-y)-(2x-y)2;
(6)(a-2b+c)(a+2b+c).
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(1)-t(-t)2-t3;
(2)(-2a)3-(-a)•(3a)2;
(3)(3xy2)2+(-xy)•(-4xy3);
(4)(x-1)(x2+x+1);
(5)(2x+y)(2x-y)-(2x-y)2;
(6)(a-2b+c)(a+2b+c).