计算: (1)﹣8﹣7﹣(﹣10); (2)18×(﹣ )﹣(﹣ )×(﹣6);(3)﹣10+8÷(﹣2) 2 ﹣(﹣

2025-05-21 17:40:26
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回答(1):

解:(1)﹣8﹣7﹣(﹣10)
=﹣8﹣7+10
=﹣15+10
=﹣5;
(2)18×(﹣ )﹣(﹣ )×(﹣6)
=﹣4﹣10
=﹣14;
(3)﹣10+8÷(﹣2) 2 ﹣(﹣4)×(﹣3)
=﹣10+8÷4﹣12
=﹣10+2﹣12
=﹣22+2
=﹣20;
(4)x 2 ﹣5xy+xy+2x 2
=(1+2)x 2 +(﹣5+1)xy
=3x 2 ﹣4xy;
(5)﹣(2x﹣y)+(2x﹣3y)
=﹣2x+y+2x﹣3y
=﹣2y.