摘要:计算:(1+)?(a2-1)16.如图11,我们称每个小正方形的顶点为“格点 ,以格点为顶点的三角形叫做“格点三角形 .根据图形解答下列问题:
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观察下列计算:
=1-
,
=
-
,
=
-
,
=
-
…从计算结果中找规律,利用规律计算
+
+
+
+…
= .
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1 |
1×2 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
4×5 |
1 |
4 |
1 |
5 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
4×5 |
1 |
2010×2011 |
计算题:
(1)-4+
+3.2-16-
+16.8;
(2)(-121)÷
×(-
)÷(-16);
(3)(1
+2
-3
)×(-24);
(4)-32-[-5-0.2÷
×(-2)2];
(5)-10-9÷(-2
)-5×(-
)÷(-
)2;
(6)1-2+3-4+5-6+…+999-1000.
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(1)-4+
2 |
7 |
5 |
7 |
(2)(-121)÷
11 |
4 |
4 |
11 |
(3)(1
3 |
8 |
1 |
3 |
3 |
4 |
(4)-32-[-5-0.2÷
4 |
5 |
(5)-10-9÷(-2
1 |
4 |
1 |
5 |
1 |
2 |
(6)1-2+3-4+5-6+…+999-1000.
计算:
(1)-20+(-14)-(-18)-13;
(2)3
-(-15)-(-3
)+(-15);
(3)(-81)÷2
×
÷(-16);
(4)(1-
+
)×(-48).
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(1)-20+(-14)-(-18)-13;
(2)3
1 |
4 |
1 |
8 |
(3)(-81)÷2
1 |
4 |
4 |
9 |
(4)(1-
1 |
6 |
3 |
4 |