算一算:(1)20+(﹣12)﹣(﹣18)(2)2 3 ×10+(﹣2)×(﹣5) 2 (3) (4) (5) (6)

2025-05-22 12:20:43
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回答(1):

解:(1)原式=20﹣12+18=38﹣12=26.
(2)原式=8×10﹣2×25=80﹣50=30.
(3)原式= =﹣3+2=﹣1.
(4)原式= =﹣27﹣20+21=﹣26.
(5)原式=
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(6)原式=
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=﹣1+20+8
=27.