问题
解答题
计算下列各题: (1)3
(2)-32×(-
(3)-7×(-
(4)|-2
|
答案
(1)原式=3
+1 2
+21 3
-2 3
=(31 2
-1 2
)+(1 2
+21 3
)=3+3=6;2 3
(2)原式=-9×
-(-8)×4=-1+32=31;1 9
(3)原式=-7×(-
)+26×(-22 7
)+2×(-22 7
)=(-22 7
)×(-7+26+2)=(-22 7
)×21=-66;22 7
(4)原式=2
+2.5+1-11 2
=4.5.1 2