题目内容

递等式计算:
420÷60×154= 774÷(27+16)= (45-26)×33=
230-735÷35= 148-48×2= 181-(109+43)=
分析:(1)按照从左到右的顺序计算;
(2)先算小括号里面的加法,再算括号外的除法;
(3)先算小括号里面的减法,再算括号外的乘法;
(4)先算除法,再算减法;
(5)先算乘法,再算减法;
(6)先算小括号里面的加法,再算括号外的减法.
解答:解:(1)420÷60×154,
=7×154,
=1078;

(2)774÷(27+16),
=774÷43,
=18;

(3)(45-26)×33,
=19×33,
=627;

(4)230-735÷35,
=230-21,
=209;

(5)148-48×2,
=148-96,
=52;

(6)181-(109+43),
=181-152,
=29.
点评:解决本题先理清楚运算顺序,然后根据运算顺序逐步求解即可.
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