问题
解答题
计算题. (1)
(2)4
(3)(
(4)(
|
答案
(1)(-144)×(-169)
=144×169
=
×144 169
=12×13
=276;
(2)4
+5
-45
+48 2
=4
+35
-25
+42 2
=7
+25
;2
(3)(
+1)(2-2
)2
=2
-(2
)2+2-2 2
=2
-2+2-2 2
=
;2
(4)(
+1)2-23 48
=(
)2+23
+1-83 3
=3+2
+1-83 3
=4-6
.3