问题
解答题
计算:
|
答案
原式=
,2(
-11
)-4(7
-7
) 5 (
-7
)(5
-11
) 7
=
-2
-7 5
,4
-11 7
=(
+7
)-(5
+11
),7
=
-5
.11
计算:
|
原式=
,2(
-11
)-4(7
-7
) 5 (
-7
)(5
-11
) 7
=
-2
-7 5
,4
-11 7
=(
+7
)-(5
+11
),7
=
-5
.11