3h+2a=5.8,3a+2h=5.7.求h×a

题目

3h+2a=5.8,3a+2h=5.7.求h×a

答案

3h+2a=5.8(1),3a+2h=5.7(2)
(1)+(2),得5a+5h=11.5
转化,得3a+3h=6.9(3)
(3)-(1),得a=1.1
(3)-(2),得h=1.2
所以h*a=1.1*1.2=1.32