198×78 怎样用简便方法计算呀
问题描述:
198×78 怎样用简便方法计算呀
答
198x78=(200-2)x78=200x78-2x78=15600-156=15444能用脱式计算吗198x78=(200-2)x78=200x78-2x78=15600-156=15444第三部有点不简便呀
198×78 怎样用简便方法计算呀
198x78=(200-2)x78=200x78-2x78=15600-156=15444能用脱式计算吗198x78=(200-2)x78=200x78-2x78=15600-156=15444第三部有点不简便呀