问题
解答题
计算:(1
|
答案
原式=(
-7 4
-7 8
)×(-7 12
)7 8
=
×(-7 4
)-8 7
×(-7 8
)-7 8
×(-7 12
)8 7
=-2+1+2 3
=-
.1 3
计算:(1
|
原式=(
-7 4
-7 8
)×(-7 12
)7 8
=
×(-7 4
)-8 7
×(-7 8
)-7 8
×(-7 12
)8 7
=-2+1+2 3
=-
.1 3