题目内容
递等式计算.(能简算的要简算) 9.6÷0.4×0.25 |
29.7÷(5.85÷0.65) |
7.4×9.9 | 3.84-2.7×0.64 |
8.68-8.68÷0.56×0.5 | 4.7×4.7+4.7+4.3×4.7. |
分析:(1)从左到右依次计算,
(2)先算括号里面的除法,再算括号外面的除法,
(3)根据乘法分配律进行计算,
(4)先算乘法,再算减法,
(5)先算除法,再算乘法,最后算减法,
(6)根据乘法分配律进行计算.
(2)先算括号里面的除法,再算括号外面的除法,
(3)根据乘法分配律进行计算,
(4)先算乘法,再算减法,
(5)先算除法,再算乘法,最后算减法,
(6)根据乘法分配律进行计算.
解答:解:(1)9.6÷0.4×0.25,
=24×0.25,
=6;
(2)29.7÷(5.85÷0.65),
=29.7÷9,
=3.3;
(3)7.4×9.9,
=7.4×(10-0.1),
=7.4×10-7.4×0.1,
=74-0.74,
=73.26;
(4)3.84-2.7×0.64,
=3.84-1.728,
=2.112;
(5)8.68-8.68÷0.56×0.5,
=8.68-15.5×0.5,
=8.68-7.75,
=0.93;
(6)4.7×4.7+4.7+4.3×4.7,
=4.7×(4.7+4.3+1),
=4.7×10,
=47.
=24×0.25,
=6;
(2)29.7÷(5.85÷0.65),
=29.7÷9,
=3.3;
(3)7.4×9.9,
=7.4×(10-0.1),
=7.4×10-7.4×0.1,
=74-0.74,
=73.26;
(4)3.84-2.7×0.64,
=3.84-1.728,
=2.112;
(5)8.68-8.68÷0.56×0.5,
=8.68-15.5×0.5,
=8.68-7.75,
=0.93;
(6)4.7×4.7+4.7+4.3×4.7,
=4.7×(4.7+4.3+1),
=4.7×10,
=47.
点评:本题主要考查了学生在四则运算中,合理运用简便算法的能力.注意要细心.
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