问题
解答题
计算: (1)用简便方法计算:(-
(2)计算8+(-3)2×(-2); |
答案
(1)原式=[(-
)+(-31 5
)+(-72 5
)]+[(-12 5
)+(+23 4
)]=[-10-1]+[1-1 4
]=-101 2
;1 2
(2)原式=8-9×2=-10.
计算: (1)用简便方法计算:(-
(2)计算8+(-3)2×(-2); |
(1)原式=[(-
)+(-31 5
)+(-72 5
)]+[(-12 5
)+(+23 4
)]=[-10-1]+[1-1 4
]=-101 2
;1 2
(2)原式=8-9×2=-10.