问题
解答题
计算: (1)-12+13-(9-18) (2)5
(3)5+3×(-2)3+33 (4)30÷(
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答案
(1)-12+13-(9-18)
=-12+13-(-9)
=-12+13+9
=-12+22
=10;
(2)5
-[21 5
+(-4.8)-(-41 6
)]5 6
=5
-(21 5
-4.8+41 6
)5 6
=5
-7+4.81 5
=10-7
=3;
(3)5+3×(-2)3+33
=5+3×(-8)+27
=5-24+27
=32-24
=8;
(4)30÷(
-1 5
)1 6
=30÷1 30
=30×30
=900.