题目内容
计算下面各题 (145+55)÷20 |
420÷60×154 |
774÷(27+16) | 230-735÷35 |
480÷32-15 | 244-63×3. |
分析:(1)先算小括号里面的加法,再算括号外的除法;
(2)按照从左到右的顺序计算;
(3)先算小括号里面的加法,再算括号外的除法;
(4)(5)先算除法,再算减法;
(6)先算乘法,再算减法.
(2)按照从左到右的顺序计算;
(3)先算小括号里面的加法,再算括号外的除法;
(4)(5)先算除法,再算减法;
(6)先算乘法,再算减法.
解答:解:(1)(145+55)÷20
=200÷20
=10;
(2)420÷60×154
=7×154
=1078;
(3)774÷(27+16)
=774÷43
=18;
(4)230-735÷35
=230-21
=209;
(5)480÷32-15
=15-15
=0;
(6)244-63×3
=244-189
=55.
=200÷20
=10;
(2)420÷60×154
=7×154
=1078;
(3)774÷(27+16)
=774÷43
=18;
(4)230-735÷35
=230-21
=209;
(5)480÷32-15
=15-15
=0;
(6)244-63×3
=244-189
=55.
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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