问题
解答题
3.5×9.9+6.5×10.1.
答案
3.5×9.9+6.5×10.1,
=3.5×(10-0.1)+6.5×(10+0.1),
=3.5×10-3.5×0.1+6.5×10+6.5×0.1,
=35-0.35+65+0.65,
=(35+65)+(0.65-0.35)
=100+0.3,
=100.3.
3.5×9.9+6.5×10.1.
3.5×9.9+6.5×10.1,
=3.5×(10-0.1)+6.5×(10+0.1),
=3.5×10-3.5×0.1+6.5×10+6.5×0.1,
=35-0.35+65+0.65,
=(35+65)+(0.65-0.35)
=100+0.3,
=100.3.