问题
解答题
在18+（18×21-21）÷3的算式里，第一步求______，最后一步求______
A．商 B．和 C．差 D．积．
答案
18+（18×21-21）÷3，
=18+（378-21）÷3，
=18+357÷3，
=18+119，
=137；
先算乘法，求积，最后算加法，求和．
故选：D，B．
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在18+（18×21-21）÷3的算式里，第一步求______，最后一步求______
A．商 B．和 C．差 D．积．
18+（18×21-21）÷3，
=18+（378-21）÷3，
=18+357÷3，
=18+119，
=137；
先算乘法，求积，最后算加法，求和．
故选：D，B．
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