括号9+9×9+9×9括住乘以0.01怎么简便方法计算?

2024-11-05 23:31:12
推荐回答(3个)
回答1:

(9+9×9+9×9)×0.01
[(9+1)×9+9×9]x0.01
(10×9+9×9)×0.01
9×(10+9)×0.01
9×19×0.01
=1.71

回答2:

(9+9x9+9x9)x0.01
=[9x(1+1+9+9)-9]x0.01
=(9x20-9)x0.01
=(180-9)x0.01
=171x0.01
=1.71

回答3:

(9+9X9+9x9)X0.01
=[9x(1+9+9)]x0.01
=[9x19]X0.01
=171x0.01
=1.71