问题
解答题
计算: (1)(-2
(2)(
(3)-23÷
|
答案
(1)(-2
)+(+1 2
)+(-5 6
)+(+11 2
)1 6
=(-2
-1 2
)+(1 2
+15 6
)1 6
=-3+2
=-1;
(2)(
-7 9
+5 6
-3 4
)×367 18
=
×36-7 9
×36+5 6
×36-3 4
×367 18
=28-30+27-14
=11;
(3)-23÷
×(-4 9
)2+(-0.8)-5×(-2 3
)1 22
=-8×
×9 4
-0.8+5×4 9 1 4
=-8+0.8+1.25
=-7.55.