问题
解答题
丽丽遇到一道简算题,百思不得其解,你能帮帮她吗?
13.5×10.1+6.5×9.9.
答案
13.5×10.1+6.5×9.9,
=13.5×(10+0.1)+6.5×(10-0.1),
=13.5×10+13.5×0.1+6.5×10-6.5×0.1,
=(13.5+6.5)×10+(13.5-6.5)×0.1,
=20×10+7×0.1,
=200+0.7,
=200.7.
丽丽遇到一道简算题,百思不得其解,你能帮帮她吗?
13.5×10.1+6.5×9.9.
13.5×10.1+6.5×9.9,
=13.5×(10+0.1)+6.5×(10-0.1),
=13.5×10+13.5×0.1+6.5×10-6.5×0.1,
=(13.5+6.5)×10+(13.5-6.5)×0.1,
=20×10+7×0.1,
=200+0.7,
=200.7.