计算270×30时,先算___,最后在积的末尾添上___个0,积是___位数,相当于27×3的积乘___.
在横线上里填上“>”、“<”或“=”30×3___20×3 1kg___900g 460÷2___690÷3600÷9___360÷6 800+2___800×2 90+0___90-03000米___5千米 2时___200分 600毫米_
3. Go to work on foot instead of by bus every day. 4. Take a walk after supper every day. Food 1. Have only a glass of milk and an egg for breakfast every morning. 2. Just have fruit for supper three times a week. 3. Eat more vegetables and less meat for dinner. 4. ...
根据句意及首字母.汉语和音标提示在下面的空格中填上一个意思恰当的词.1. China, with an area of 9.6 million square kilometers, is a seventeen times the size of France. 2. It's a pity that you [mist] the chance to study abroad. 3. Oct. l1 is our Day
从2开始,连续的偶数相加,它们和的情况如表: 加数的个数n 连续偶数的和S 1 2=1×2 2 2+4=6=2×3 3 2+4+6=12=3×4 4 2+4+6+8=20=4×5 5 2+4+6+8+10=30=5×6
840÷30=(840÷10)÷(30÷10)=84÷3 360÷25=(360×4)÷(25×4)在除法算式中,被除数和除数同时扩大或缩小相同的倍数(0除外),商不变.故答案为:84,4,4;在除法算式中,被除数和除数同时扩大或缩小相同的倍数(0除外),商不变. 在除法算式中,被除数和除数同时扩大或缩小相同的倍数(0除外),商不变;据此...
加数的个数n 连续偶数的和S 1 2=1×2 2 2+4=6=2×3 3 2+4+6=12=3×4 4 2+4+6+8=20=4×5 5 2+4+6+8+10=30=5×6(1)如果n=8时,那么S的值为___(2)根据表中的规律猜想:用n的代数式表示S的公式为S=2+4+56+8+…+2n=___;...
Mrs. Ball has a son. His name is Mick. She _ _1_ _ him very much and as he is not a __ 2 __ child, she is always _ _3_ _ that he may be ill, _ _4_ _ she takes him to see the best _ _5_ _ in the town four times a year and the doctor always looks