问题
解答题
(1)解方程:x2+8x-9=0 (2)|-2|+2sin30°-(-
|
答案
(1)x2+8x-9=0,
∴(x+9)(x-1)=0,
∴x1=-9,x2=1;
(2)|-2|+2sin30°-(-
)2+(tan45°)-13
=2+1-3+1
=1.
(1)解方程:x2+8x-9=0 (2)|-2|+2sin30°-(-
|
(1)x2+8x-9=0,
∴(x+9)(x-1)=0,
∴x1=-9,x2=1;
(2)|-2|+2sin30°-(-
)2+(tan45°)-13
=2+1-3+1
=1.