Question

六点5+7点五三×6点5+6点五怎么简便呢

六点5+7点五三×6点5+6点五怎么简便呢

Answer 1

6.5+7.53×6.5+6.5
提取公因数6.5
=6.5x（1+7.53+1）
=6.5x9.53
=6.5x（10-0.47）
=65-6.5x0.47
=65-（10-3.5）x0.47
=65-4.7+3.5x0.47
=60.3+（3+0.5）x0.47
=60.3+1.41+0.235
=61.71+0.235
=61.945

Answer 2

6.5+7.53x6.5+6.5
=6.5x(1+7.53+1)
=6.5x9.53
=6.5x10-6.5x0.47
=65-6.5x0.4-6.5x0.07
=65-2.6-0.455
=65-3.055
=61.945