题目内容
脱式计算.
8×8-46
=
=
72÷9+149
=
=
8×8-46
=
=
72÷9+149
=
=
分析:8×8-46先算乘法,再算减法;
72÷9+149先算除法,再算加法.
72÷9+149先算除法,再算加法.
解答:解:8×8-46,
=64-46,
=18;
72÷9+149,
=8+149,
=157.
=64-46,
=18;
72÷9+149,
=8+149,
=157.
点评:一个算式里,如果含有两级运算,要先做第二级运算,后做第一级运算.
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