简便计算.15.6789÷20÷52.8×23.4+11.1×57.6+6.54×2834.5×8.23-34.5+2.77×34.50.9999×0.7+0.11
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解决时间 2021-12-18 00:05
- 提问者网友:几叶到寒
- 2021-12-17 18:12
简便计算. 15.6789÷20÷52.8×23.4+11.1×57.6+6.54×2834.5×8.23-34.5+2.77×34.50.9999×0.7+0.1111×2.7.
最佳答案
- 五星知识达人网友:夜余生
- 2021-12-17 19:44
解:
(1)15.6789÷20÷5,
=15.6789÷(20×5),
=15.6789÷100,
=0.156789;
(2)2.8×23.4+11.1×57.6+6.54×28,
=28×2.34+6.54×28+11.1×57.6,
=28×(2.34+6.54)+11.1×57.6,
=28×8.88+11.1×57.6,
=28×8×1.11+1.11×576,
=224×1.11+1.11×576,
=(224+576)×1.11,
=800×1.11,
=888;
(3)34.5×8.23-34.5+2.77×34.5,
=34.5×(8.23-1+2.77),
=34.5×10,
=345;
(4)0.9999×0.7+0.1111×2.7,
=0.1111×9×0.7+0.1111×2.7,
=0.1111×6.3+0.1111×2.7,
=0.1111×(6.3+2.7),
=0.1111×9,
=0.9999.解析分析:(1)15.6789连续除以20与5,等于除以20与5的乘积;(2)根据乘法分配律进行简算;(3)根据乘法分配律进行简算;(4)根据乘法分配律进行简算.点评:根据题意,找准所运用的运算定律,然后再进一步计算即可.
(1)15.6789÷20÷5,
=15.6789÷(20×5),
=15.6789÷100,
=0.156789;
(2)2.8×23.4+11.1×57.6+6.54×28,
=28×2.34+6.54×28+11.1×57.6,
=28×(2.34+6.54)+11.1×57.6,
=28×8.88+11.1×57.6,
=28×8×1.11+1.11×576,
=224×1.11+1.11×576,
=(224+576)×1.11,
=800×1.11,
=888;
(3)34.5×8.23-34.5+2.77×34.5,
=34.5×(8.23-1+2.77),
=34.5×10,
=345;
(4)0.9999×0.7+0.1111×2.7,
=0.1111×9×0.7+0.1111×2.7,
=0.1111×6.3+0.1111×2.7,
=0.1111×(6.3+2.7),
=0.1111×9,
=0.9999.解析分析:(1)15.6789连续除以20与5,等于除以20与5的乘积;(2)根据乘法分配律进行简算;(3)根据乘法分配律进行简算;(4)根据乘法分配律进行简算.点评:根据题意,找准所运用的运算定律,然后再进一步计算即可.
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- 1楼网友:醉吻情书
- 2021-12-17 21:15
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