相关知识点: 试题来源: 解析 本题考查了乘法和加法的混合运算。根据题意,先把原式化简为A×(A+1)=240,再根据乘法口诀“五五二十五”,把240写成15×16,即可求出A的值。A×A+A=240A×(A+1)=240因为15×16=240,所以A=15故答案为:1515 反馈 收藏
$$ A \times A + A = 2 4 0 $$ 相关知识点: 试题来源: 解析 【分析】根据题意,A×A+A=240,即A×(A+1)=240,根据乘法口诀,15×16=240,所以A=15。【解答】1、A×A+A=240A×(A+1)=240A=15【点评】本题也可以用方程来解,即A×A+A=240,A×(A+1)=240,A=15。
The vertebrate brain emerged more than ~500 million years ago in common evolutionary ancestors. To systematically trace its cellular and molecular origins, we established a spatially resolved cell type atlas of the entire brain of the sea lamprey—a jawl
To test this potential interaction, we performed yeast two-hybrid assays; a modest interaction between WRT-1 and PTR-16 was observed (Fig. 6c,d), suggesting that PTR-16 is most probably the receptor that receives the pro-aging Hedgehog WRT-1 signal from the germline upon mating. Fig. 5:...
The distal ileum (about 10 cm) was carefully exteriorized and manipulated three times with a sterile cotton stick moisturized with sterile physiological saline. After intestinal manipulation, the ileum was placed back into the abdominal cavity, and the abdominal wall was closed with two layers of...
试题来源: 解析 ± 2 √(59);15;-16 (1)A* A+4=240 A^2=240-4 A^2=236 A= ± 2 √(59) (2)A(A+1)=240 A^2+A-240=0 A= (-1± √(1+4* 240))/2 A= (-1± √(961))/2 A= (-1± 31)/2 A=15,A=-16反馈 收藏 ...
一、填一填。1. 已知$$ a \times b = 2 4 0 $$,如果a乘2,b不变,则积是( );如果a不变,b除以4,则积是( )。2.全世界平均每分钟大
Artificial photosynthesis systems are proposed as an efficient alternative route to capture CO2 to produce additional food for growing global demand. Here a two-step CO2 electrolyser system was developed to produce a highly concentrated acetate stream wi
Drug development based on target proteins has been a successful approach in recent decades. However, the conventional structure-based drug design (SBDD) pipeline is a complex, human-engineered process with multiple independently optimized steps. Here, we
Check the Samsung A51 specs and buy them at the best price in the Philippines. Experience the Game Booster mode, a 48MP Quad Rear Camera, 6GB RAM, and more.