问题 解答题
计算题.
(1)
(-144)×(-169)

(2)4
5
+
45
-
8
+4
2

(3)(
2
+1)(2-
2
)

(4)(
3
+1)2-2
48
答案

(1)

(-144)×(-169)

=

144×169

=

144
×
169

=12×13

=276;

(2)4

5
+
45
-
8
+4
2

=4

5
+3
5
-2
2
+4
2

=7

5
+2
2

(3)(

2
+1)(2-
2

=2

2
-(
2
2+2-
2

=2

2
-2+2-
2

=

2

(4)(

3
+1)2-2
48

=(

3
2+2
3
+1-8
3

=3+2

3
+1-8
3

=4-6

3

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