21.5+4.87+8.95要怎么简算?
问题描述:
21.5+4.87+8.95要怎么简算?
答
如果能,怎么做?9.99×4.87=10×4.87-0.01×4.87 =48.7-0.0487 =48.6513 9.99*4.87=(10-0.01)*4.87=10*4.87-0.01*4
21.5+4.87+8.95要怎么简算?
如果能,怎么做?9.99×4.87=10×4.87-0.01×4.87 =48.7-0.0487 =48.6513 9.99*4.87=(10-0.01)*4.87=10*4.87-0.01*4