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
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
太难