9.87*7.2-0.987 怎么简便运算

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9.87*7.2-0.987 怎么简便运算
9.87*7.2-0.987 怎么简便运算

9.87*7.2-0.987 怎么简便运算
9.87*7.2-0.987
0.987x7.2x10-0.987
=0.987x(72-1)
=0.987x(70+1)
=0.987x70+0.987
=69.09+0.987
=70.077

=9.87*7.2-9.87**0.1
=9.87*(7.2-0.1)
=9.87*7.1
=70.077

好像不行吧