问题
解答题
计算: (1)-
(2)(
(3)-1
(4)-42÷(-
|
答案
(1)-
×(-3)+(-1 3
)×51 5
=1-1
=0;
(2)(
-2 3
-11 12
)×(-60)14 15
=-
×60+2 3
×60+11 12
×6014 15
=-40+55+56
=71;
(3)-1
-(-3 4
)+31 8
+(-23 8
)1 4
=(-1
-23 4
)+(1 4
+31 8
)3 8
=-4+31 2
=-
;1 2
(4)-42÷(-
)÷(-1)7+(11 2
+11 8
-1 3
)×243 4
=-16×2÷1+(27+32-18)
=-32+41
=9.