Question

填空:3()()()x9()=2()()()1+30()170=33()()()1

Answer 1

3413*97 ＝ 331061.

(1).设3abc * 9d = 2()()()1

c*d = 1

c*9 = 7

3 * 9 ＝ 27,所以c = 3 ,得3*d 1,所以d = 7

(2).b*9 + 2= 1 //2是3*9得到的进位

所以b = 1

(3).3*9 + 3 = 30,所以 a*9 = ,所以a = 4

所以a = 4,b = 1,c = 3,d =7,

3413*97 = 331061