题目内容
脱式计算. 67+35×5 |
89-32×2 | 16×7-57 | 420÷6+35 | 45÷5×9. |
分析:(1)先算乘法,再算加法;
(2)(3)先算乘法,再算减法;
(4)先算除法,再算加法;
(5)按照从左到右的顺序计算.
(2)(3)先算乘法,再算减法;
(4)先算除法,再算加法;
(5)按照从左到右的顺序计算.
解答:解:(1)67+35×5,
=67+175,
=242;
(2)89-32×2,
=89-64,
=25;
(3)16×7-57,
=112-57,
=55;
(4)420÷6+35,
=70+35,
=105;
(5)45÷5×9,
=9×9,
=81.
=67+175,
=242;
(2)89-32×2,
=89-64,
=25;
(3)16×7-57,
=112-57,
=55;
(4)420÷6+35,
=70+35,
=105;
(5)45÷5×9,
=9×9,
=81.
点评:本题考查了简单的四则混合运算,计算时先理清楚运算顺序,根据运算顺序逐步求解即可.
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