题目内容
脱式计算,能简算的要简算.
97÷1+35.6+0×6 | 1375+450÷15×25 |
[4.5+(13×+13×)]÷ | 48×+48×+48×8 |
94.47-(94.47-86.555) | 3.42×76.3+76.3×5.76+9.18×23.7. |
解:(1)97÷1+35.6+0×6
=97+35.6+0,
=132.6;
(2)1375+450÷15×25
=1375+30×25,
=1375-750,
=625;
(3)[4.5+(13×+13×)]÷
=[4.5+(13××2)]÷,
=[4.5+9.75]÷,
=14.25×,
=8.55;
(4)48×+48×+48×8
=(++8)×48,
=9×48,
=432;
(5)94.47-(94.47-86.555)
=94.47-94.47+86.555,
=0+86.555,
=86.555;
(6)3.42×76.3+76.3×5.76+9.18×23.7
=(3.42+5.76)×76.3+9.18×23.7,
=9.18×76.3+9.18×23.7,
=(76.3+23.7)×9.18,
=100×9.18,
=918.
分析:(1)(2)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
(4)(6)可根据乘法分配律计算;
(5)可根据一个数减两个数的差,等于减去这两个数的中被减数加上减数的减法性质计算.
点评:完成本题要注真分析式中数据的特点,然后运用合适的方法计算.
=97+35.6+0,
=132.6;
(2)1375+450÷15×25
=1375+30×25,
=1375-750,
=625;
(3)[4.5+(13×+13×)]÷
=[4.5+(13××2)]÷,
=[4.5+9.75]÷,
=14.25×,
=8.55;
(4)48×+48×+48×8
=(++8)×48,
=9×48,
=432;
(5)94.47-(94.47-86.555)
=94.47-94.47+86.555,
=0+86.555,
=86.555;
(6)3.42×76.3+76.3×5.76+9.18×23.7
=(3.42+5.76)×76.3+9.18×23.7,
=9.18×76.3+9.18×23.7,
=(76.3+23.7)×9.18,
=100×9.18,
=918.
分析:(1)(2)(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的;
(4)(6)可根据乘法分配律计算;
(5)可根据一个数减两个数的差,等于减去这两个数的中被减数加上减数的减法性质计算.
点评:完成本题要注真分析式中数据的特点,然后运用合适的方法计算.
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