计算题:(1)3 1 2 +(- 1 2 )-(- 1 3 )+2 2 3 (2) ( 2
计算题:(1)312+(-12)-(-13)+223(2)(23-14-38+524)×48(3)-18÷(-3)2+5×(-12)2-(-15)÷5(4)[-38-(-...
计算题:(1)3 1 2 +(- 1 2 )-(- 1 3 )+2 2 3 (2) ( 2 3 - 1 4 - 3 8 + 5 24 )×48 (3)-18÷(-3) 2 +5× (- 1 2 ) 2 -(-15)÷5(4)[-3 8 -(-1) 7 +(-3) 8 ]×[-5 2 ].
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(1)3
=(3
=3+3 =6; (2) (
=32-12-18+10 =42-30 =12; (3)-18÷(-3) 2 +5× (-
=-18÷9+5×
=-2+1.25+3 =2.25; (4)[-3 8 -(-1) 7 +(-3) 8 ]×[-5 2 ] =[-3 8 +3 8 +1]×(-25) =1×(-25) =-25. |
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