题目内容
(1)(-
-
+
-
)×(-72).
(2)8+(-3)2×(-2)-22.
(3)(-1)2006-23÷(-4)3-
.
(4)
+
+
+…+
.
1 |
2 |
1 |
3 |
5 |
6 |
7 |
12 |
(2)8+(-3)2×(-2)-22.
(3)(-1)2006-23÷(-4)3-
1 |
8 |
(4)
1 |
2×4 |
1 |
4×6 |
1 |
6×8 |
1 |
198×200 |
(1)原式=-
×(-72)-
×(-72)+
×(-72)-
×(-72)
=36+24-60+42
=42;
(2)原式=8+9×(-2)-4
=8-18-4
=-14;
(3)原式=1-8÷(-64)-
=1+
-
=1;
(4)原式=
×(
-
)+
×(
-
)+
×(
-
)+…+
×(
-
)
=
×(
-
+
-
+
-
+…+
-
)
=
×(
-
)
=
×
=
.
1 |
2 |
1 |
3 |
5 |
6 |
7 |
12 |
=36+24-60+42
=42;
(2)原式=8+9×(-2)-4
=8-18-4
=-14;
(3)原式=1-8÷(-64)-
1 |
8 |
=1+
1 |
8 |
1 |
8 |
=1;
(4)原式=
1 |
2 |
1 |
2 |
1 |
4 |
1 |
2 |
1 |
4 |
1 |
6 |
1 |
2 |
1 |
6 |
1 |
8 |
1 |
2 |
1 |
198 |
1 |
200 |
=
1 |
2 |
1 |
2 |
1 |
4 |
1 |
4 |
1 |
6 |
1 |
6 |
1 |
8 |
1 |
198 |
1 |
200 |
=
1 |
2 |
1 |
2 |
1 |
200 |
=
1 |
2 |
99 |
200 |
=
99 |
400 |
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