怎样算简便就怎样算.1.28+9.8+7.72+10.2 ×+× ÷(﹣)××[﹣(+)] (80﹣9.8)×0.6﹣2.1 (﹣)×45.
(7.5+7.5+7.5+7.5)×125×4.
1999+999×999.
8888008×125.
3.75×4.23×36﹣125×0.423×2.8.
25×2.64+12.5×0.726+0.125.