Question

数学专家来看看，这几道题的简便运算

0.25x0.9x0.4 8.35x98 0.97x99+0.97 0.87x101
= =
= =
= = 全部用脱式计算！！！！！

Answer 1

0.25x0.9x0.4
=0.25x0.4x0.9
=0.1x0.9
=0.09

8.35x98
=8.35x(100-2)
=835-16.7
=818.3

0.97x99+0.97
=0.97x(99+1)
=0.97x100
=97

0.87x101
=0.87x(100+1)
=87+0.87
=87.87

希望有帮助

Answer 2

晕.
（1）=0.25乘0.4乘0.9
=0.09

（2）=8.35乘（100-2）
=8.35乘100-8.35乘2
=835-16.7
=818.3

（3）=0.97乘（99+1）
=0.97乘100
=97

（4）=0.87乘（100+1）
=0.87乘100+0.87
=87+0.87
=87.87

Answer 3

太难