问题
解答题
(1)计算:2×(-3)+16×(
(2)解方程:x2-6x+8=0. |
答案
(1)原式=-6+16×
-11 4
=-6+4-1
=-3;
(2)∵(x-2)(x-4)=0,
∴x-2=0或x-4=0,
∴x1=2,x2=4.
(1)计算:2×(-3)+16×(
(2)解方程:x2-6x+8=0. |
(1)原式=-6+16×
-11 4
=-6+4-1
=-3;
(2)∵(x-2)(x-4)=0,
∴x-2=0或x-4=0,
∴x1=2,x2=4.