计算:(1)312+(-12)-(-13)+223;(2)-127÷(-156)×138×(-7);(3)-22×(-12)+8÷(-2)2;(4)-3-[-5+(1-2×35)÷(-2)];(5)-2-12×(13-14+12).-数学
题文
计算: (1)3
(2)-1
(3)-22×(-
(4)-3-[-5+(1-2×
(5)-2-12×(
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答案
(1)原式=3
=3+3 =6; (2)原式=-(
=-
(3)原式=4×
=2+2 =4; (4)原式=-3+5-(1-2×
=2-(-
=2-
=
(5)原式=-2-(
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