算一算:(1)20+(-12)-(-18)(2)23×10+(-2)×(-5)2(3)83÷(-89)-(25)×(-5)(4)(-34-59+712)÷136(5)|-79|÷(23-0.2)-13×(-4)2(6)-12008-[0.1252008×(-8)2009+(-12)÷6]2×(-15)+|-2|-数学
题文
算一算: (1)20+(-12)-(-18) (2)23×10+(-2)×(-5)2 (3)
(4)(-
(5)|-
(6)-12008-[0.1252008×(-8)2009+(-12)÷6]2×(-
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答案
(1)原式=20-12+18=38-12=26. (2)原式=8×10-2×25=80-50=30. (3)原式=
(4)原式=-
(5)原式=
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=
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