用递等式计算.
235+24×122.6÷(0.74-0.24)×2.5×+[1-()]÷.
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解:235+24×12
=235+288,
=523;
2.6÷(0.74-0.24)×2.5
=2.6÷0.5×2.5,
=5.2×2.5,
=13;
×+
=+,
=+,
=;
[1-()]÷
=[1-()],
=[1-]×,
=×,
=.
解析分析:本题根据四则混合运算的运算法则计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
点评:在算式中同时含有中括号与小括号时,要先算小括号内的,再算中括号内的.