题目内容
394+8×7,693-(271+169) | 400-256-78,(416-360)÷7. |
解:
(1)394+8×7,
=394+56,
=450;
(2)693-(271+169),
=693-440,
=253;
(3)400-256-78,
=144-78,
=66;
(4)(416-360)÷7,
=56÷7,
=8.
分析:(1)先算乘法,再算加法;
(2)先算加法,再算减法;
(3)按照从左向右的顺序计算;
(4)先算减法,再算除法.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
(1)394+8×7,
=394+56,
=450;
(2)693-(271+169),
=693-440,
=253;
(3)400-256-78,
=144-78,
=66;
(4)(416-360)÷7,
=56÷7,
=8.
分析:(1)先算乘法,再算加法;
(2)先算加法,再算减法;
(3)按照从左向右的顺序计算;
(4)先算减法,再算除法.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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