题目内容
脱式计算.
0.6+0.94-0.208 | 204×(18+405÷27) | 27.73-(4.73-1.85) | 3.84+[26.5-(20-8.6)] |
分析:(1)按照从左到右的顺序计算;
(2)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的乘法;
(3)先去括号,再计算;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的加法.
(2)先算小括号里面的除法,再算小括号里面的加法,最后算括号外的乘法;
(3)先去括号,再计算;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算括号外的加法.
解答:解:(1)0.6+0.94-0.208,
=1.54-0.208,
=1.332;
(2)204×(18+405÷27),
=204×(18+15),
=204×33,
=6732;
(3)27.73-(4.73-1.85),
=27.73-4.73+1.85,
=23+1.85,
=24.85;
(4)3.84+[26.5-(20-8.6)],
=3.84+[26.5-11.4],
=3.84+15.1,
=18.94.
=1.54-0.208,
=1.332;
(2)204×(18+405÷27),
=204×(18+15),
=204×33,
=6732;
(3)27.73-(4.73-1.85),
=27.73-4.73+1.85,
=23+1.85,
=24.85;
(4)3.84+[26.5-(20-8.6)],
=3.84+[26.5-11.4],
=3.84+15.1,
=18.94.
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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