A-A+
计算题:(1)312+(-12)-(-13)+223(2)(23-14-38+524)×48
问题详情
计算题:
(1)3
(2)(
(3)-18÷(-3)2+5×(-
(4)[-38-(-1)7+(-3)8]×[-52].
参考答案
(1)312+(-12)-(-13)+223
=(312-12)+(13+223)
=3+3
=6;
(2)(23-14-38+524)×48
=32-12-18+10
=42-30
=12;
(3)-18÷(-3)2+5×(-12)2-(-15)÷5
=-18÷9+5×14+3
=-2+1.25+3
=2.25;
(4)[-38-(-1)7+(-3)8]×[-52]
=[-38+38+1]×(-25)
=1×(-25)
=-25.
考点: