81÷9=____ 9×7=____ 90÷10=____ 7×6=____
—The cost of food and clothing is going up nearly every day.
—Yes, the price of vegetables is much than before.
干细胞移植现已成为治疗糖尿病的一种临床新技术。自体骨髓干细胞植入胰腺组织后可分化为胰岛样细胞,以替代损伤的胰岛B细胞,达到治疗糖尿病的目的。下列叙述正确的是()
如图是我国古代数学家赵爽在为《周髀算经》作注解时给出的“弦图”,它解决的数学问题是 ____