题目内容
脱式计算 3×13+55 | 46×3-56 | (45+15)÷6 |
360÷6÷4 | 360-240÷6 | 810÷(3×3) |
考点:整数四则混合运算
专题:运算顺序及法则
分析:(1)先算乘法,再算加法;
(2)先算乘法,再算减法;
(3)先算加法,再算除法;
(4)按照从左到右的顺序计算;
(5)先算除法,再算减法;
(6)先算乘法,再算除法.
(2)先算乘法,再算减法;
(3)先算加法,再算除法;
(4)按照从左到右的顺序计算;
(5)先算除法,再算减法;
(6)先算乘法,再算除法.
解答:
解:(1)3×13+55
=39+55
=94;
(2)46×3-56
=138-56
=82;
(3)(45+15)÷6
=60÷6
=10;
(4)360÷6÷4
=60÷4
=15;
(5)360-240÷6
=360-40
=320;
(6)810÷(3×3)
=810÷9
=90.
=39+55
=94;
(2)46×3-56
=138-56
=82;
(3)(45+15)÷6
=60÷6
=10;
(4)360÷6÷4
=60÷4
=15;
(5)360-240÷6
=360-40
=320;
(6)810÷(3×3)
=810÷9
=90.
点评:整数混合运算的关键是抓住运算顺序,正确按运算顺序计算即可.
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