计算:(1)4.7-(-8.9)-7.5+(-6)(2)492425×(-5)(3)(79-216-134)÷(-16)2(4)(-5)×313+2×313-6×313(5)(-1)2011-(-22)×(-1)5-36×(-13)2.-数学
题文
计算: (1)4.7-(-8.9)-7.5+(-6) (2)49
(3)(
(4)(-5)×3
(5)(-1)2011-(-22)×(-1)5-36×(-
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答案
(1)4.7-(-8.9)-7.5+(-6) =4.7+8.9-7.5-6 =13.6-13.5 =0.1; (2)49
=(50-
=50×(-5)-
=-250+
=-249
(3)(
=(
=28-78-63 =-113; (4)(-5)×3
=(-5+2-6)×3
=-9×3
=-30; (5)(-1)2011-(-22)×(-1)5-36×(-
=-1-4×1-36×
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