题目内容
看谁算得都对.
28÷4×3=
6×8+15=
7×9-17=
28÷4×3=
6×8+15=
7×9-17=
分析:(1)先算除法,再算乘法;(2)先算乘法,再算加法;(3)先算乘法,再算减法.
解答:解:(1)28÷4×3,
=7×3,
=21;
(2)6×8+15,
=48+15,
=63;
(3)7×9-17,
=63-17,
=46.
=7×3,
=21;
(2)6×8+15,
=48+15,
=63;
(3)7×9-17,
=63-17,
=46.
点评:在脱式计算中,特别注意运算顺序和运算法则.
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