问题
解答题
计算 (1)
(2)-2.4÷
(3)-12×(-3)3-4×(-2)2+13. |
答案
(1)原式=
-9 12
+30 12
+8 12 12 12
=9-30+8+12 12
=-
;1 12
(2)原式=-
×12 5
×(-5 7
)1 2
=
;6 7
(3)原式=-1×(-27)-4×4+13
=27-16+13
=24.
计算 (1)
(2)-2.4÷
(3)-12×(-3)3-4×(-2)2+13. |
(1)原式=
-9 12
+30 12
+8 12 12 12
=9-30+8+12 12
=-
;1 12
(2)原式=-
×12 5
×(-5 7
)1 2
=
;6 7
(3)原式=-1×(-27)-4×4+13
=27-16+13
=24.