题目内容
计算下列各小题
(1)5﹣(﹣6)﹣(+3)
(2)
(3)
(4)﹣42÷(﹣2)﹣
(5)1﹣2+3﹣4+5﹣6+…+2019﹣2020.
(1)5﹣(﹣6)﹣(+3)
(2)
(3)
(4)﹣42÷(﹣2)﹣
(5)1﹣2+3﹣4+5﹣6+…+2019﹣2020.
解:
(1)5﹣(﹣6)﹣(+3)
=5+6﹣3
=11﹣3
=8;
(2)
=(﹣81)×
×
×(﹣
)
=2;
(3)
=
=
×(﹣36)﹣
×(﹣36)+
×(﹣36)
=(﹣28)﹣(﹣30)+(﹣27)
=(﹣56)+30
=﹣26;
(4)﹣42÷(﹣2)﹣
=﹣16÷(﹣2)﹣(﹣
)×16
=8﹣(﹣2)
=8+2
=10;
(5)1﹣2+3﹣4+5﹣6+…+2019﹣2020
=(1﹣2)+(3﹣4)+(5﹣6)+…+(2019﹣2020)
=(﹣1)+(﹣1)+…+(﹣1)(1010个﹣1相加)
=﹣1010.
(1)5﹣(﹣6)﹣(+3)
=5+6﹣3
=11﹣3
=8;
(2)
=(﹣81)×
=2;
(3)
=
=
=(﹣28)﹣(﹣30)+(﹣27)
=(﹣56)+30
=﹣26;
(4)﹣42÷(﹣2)﹣
=﹣16÷(﹣2)﹣(﹣
=8﹣(﹣2)
=8+2
=10;
(5)1﹣2+3﹣4+5﹣6+…+2019﹣2020
=(1﹣2)+(3﹣4)+(5﹣6)+…+(2019﹣2020)
=(﹣1)+(﹣1)+…+(﹣1)(1010个﹣1相加)
=﹣1010.
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