职高数学解答题
\u804c\u9ad8\u6570\u5b66b\u7ec4\u9898\u6c42\u89e3\u7b54\uff0c\u8c22\u8c22\u5927\u5bb6\uff01 (1) =2a+3b (2) =3a+3b (3) =2a+2b (4) =9a+11b
(1) =3 (2)=2
a1=2.
a5=2*3^4=162.
19.设三个数为5-d,5,5+d,依题意
5（5-d)(5+d)=80,
25-d^2=16,
d^2=9,
d=土3，
∴这三个数是2,5,8或8,5,2..
20.设降价的百分率为q,依题意
q^2=40.5/50=0.81,q>0,
∴q=0.9=90%.
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