57.8乘以58.7减去57.7乘以58.8怎么巧算？
1个回答
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57.8x58.7-57.7x58.8
=(57.7+0.1)x58.7-57.7x58.8
=57.7x58.7-57.7x58.8+0.1x58.7
=57.7x(58.7-58.8)+0.1x58.7
=0.1x58.7-57.7x0.1
=0.1x(58.7-57.7)
=0.1x1
=0.1
=(57.7+0.1)x58.7-57.7x58.8
=57.7x58.7-57.7x58.8+0.1x58.7
=57.7x(58.7-58.8)+0.1x58.7
=0.1x58.7-57.7x0.1
=0.1x(58.7-57.7)
=0.1x1
=0.1
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