题目内容
计算:
(1)4+(-9)+16+(-81)
(2)(-1)9×3+(-2)5÷8.
(1)4+(-9)+16+(-81)
(2)(-1)9×3+(-2)5÷8.
(1)4+(-9)+16+(-81),
=20+(-90),
=-70;
(2)(-1)9×3+(-2)5÷8,
=-1×3+(-32)÷8,
=-3+(-4),
=-7.
=20+(-90),
=-70;
(2)(-1)9×3+(-2)5÷8,
=-1×3+(-32)÷8,
=-3+(-4),
=-7.
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