问题
解答题
计算. (1)(-4)×5; (2)(-6)×(-9); (3)(-2)×(-
|
答案
(1)原式=-(4×5)
=-20;
(2)原式=6×9
=54;
(3)原式=-(2×
×3 5
)5 6
=-1.
计算. (1)(-4)×5; (2)(-6)×(-9); (3)(-2)×(-
|
(1)原式=-(4×5)
=-20;
(2)原式=6×9
=54;
(3)原式=-(2×
×3 5
)5 6
=-1.