问题
解答题
计算 (1)(-7)-9-(-3)+(-5); (2)(-
(3)-24×(-
(4)(-2)÷
(5)-14+8÷(-2)2-(-4)×(-3); (6)-19
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答案
(1)(-7)-9-(-3)+(-5)
=-7-9+3-5
=-21+3
=-18;
(2)(-
)+(+1 3
)+(+2 5
)+(-13 5
)2 3
=(-
-11 3
)+(+2 3
+2 5
)3 5
=-2+1
=-1;
(3)-24×(-
+1 2
-3 4
)1 3
=24×
-24×1 2
+24×3 4 1 3
=12-18+8
=2;
(4)(-2)÷
×(-3)1 3
=-6×(-3)
=18;
(5)-14+8÷(-2)2-(-4)×(-3)
=-1+8÷4-12
=-1+2-12
=-11;
(6)-19
×38 9
=(-20+
)×31 9
=-20×3+
×31 9
=-60+1 3
=-59
.2 3