问题
解答题
计算: (1)(-13)×(-6); (2)(+1
(3)(-3)÷
(4)(-3
(5)(-
(6)(-864
(7)(
(8)(-
(9)-120×(-3
|
答案
(1)原式=78;
(2)原式=
×(-5 3
)=-2;6 5
(3)原式=-3×2×2=-12;
(4)原式=
÷11 3
=11 2
×11 3
=2 11
;2 3
(5)原式=-
×(-20)+1 2
×(-20)-1 3
×(-20)-1 4
×(-20)=10-1 5
+5+4=19-20 3
=20 3
;37 3
(6)原式=(-864-
)×(-24 31
)=864×1 72
+1 72
×24 31
=12+1 72
=121 93
;1 93
(7)原式=(-
-1 3
+5 21
-3 14
)×(-42)=-2 7
×(-42)-1 3
×(-42)+5 21
×(-42)-3 14
×(-42)=14+10-9+12=36-9=25;2 7
(8)原式=-
÷(-1 30
-20 30
+3 30
-5 30
)=-12 30
÷(-1)=1 30
;1 30
(9)原式=(-120-7+37)×(-3
)=-90×(-3-8 9
)=-90×(-3)-90×(-8 9
)=270+80=350.8 9