分析:根據(jù)題意,把每個選項左右兩邊的算式各自計算出來,然后再進一步解答即可.
解答:解:
A選項:
15×(18÷3),
=15×6,
=90;
15×18÷3,
=270÷3,
=90;
所以,15×(18÷3)=15×18÷3;
B選項:
34+66×40,
=34+2640,
=2674;
(36+44)×40,
=80×40,
=3200;
所以,34+66×40≠(36+44)×40;
C選項:
540÷18-18,
=30-18,
=12;
540÷(27-18),
=540÷9,
=60;
所以,540÷18-18≠540÷(27-18);
D選項:
240÷(15×4),
=240÷60,
=4;
240÷15×4,
=16×4,
=64;
所以,240÷(15×4)≠240÷15×4.
故答案選:A.
點評:四則運算,先弄清運算順序,然后再進一步計算,能簡算的要簡算.