A:方程两边都乘以4,得3(43x-1)=12
B:去括号,得x-34=3
C:两边同除以34,得43x-1=4
D:整理,得4x-34=3
我国汉代数学家赵爽为了证明勾股定理,创制了一副“弦图”,后人称其为“赵爽弦图”(如图1).如图2由弦图变化得到,它是用八个全等的直角三角形拼接而成.记图中正方形ABCD,正方形EFGH,正方形MNKT的面积分别为S1,S2,S3,若S1+S2+S3=20,则S2的值是____
The Earth is sick
The Earth was clean and beautiful.
Now some parts are