题目内容
脱式计算. 13×(250-192÷4) |
73+420÷30-15 |
(219+28×21)÷3 | 54×(49+915÷15) |
分析:(1)先算括号里面的除法,再算减法,最后算乘法,
(2)先算除法,再算加减,
(3)先算括号里面的乘法,再算加法,最后算除以法,
(4)先算括号里面的除法,再算加法,最后算乘法.据此解答.
(2)先算除法,再算加减,
(3)先算括号里面的乘法,再算加法,最后算除以法,
(4)先算括号里面的除法,再算加法,最后算乘法.据此解答.
解答:解:(1)13×(250-192÷4),
=13×(250-48),
=13×202,
=2626;
(2)73+420÷30-15,
=73+14-15,
=72;
(3)(219+28×21)÷3,
=(219+588)÷3,
=807÷3,
=269;
(4)54×(49+915÷15),
=54×(49+61),
=54×110,
=5940.
=13×(250-48),
=13×202,
=2626;
(2)73+420÷30-15,
=73+14-15,
=72;
(3)(219+28×21)÷3,
=(219+588)÷3,
=807÷3,
=269;
(4)54×(49+915÷15),
=54×(49+61),
=54×110,
=5940.
点评:本题主要考查了学生根据四则运算的顺序进行计算的能力.注意要细心.
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