1. x^2=25/9 x=±5/3
2. 2x^2=22 x=±√11
3.x^2=5*1.8 x=±3
4.x-1=0 x=1
5.x+2=±2 x=0 x=-4
6.3x-2=±2√2 x=(±2√2 +2)/3
7.x-1=±3（2x+1）x=-4/5 x=-2/7
(1) .9x^2-25=0 , x=±5/3 , (2). 7-2x^2=-15 ,x^2=11 ,x =±√11
(3). 1/5x^2+0.7=2.5, x^2=±3 , (4). (x-1)^2=0 x=1
( 5.) (x+2)^2=4 , x1=-4 , x2=0 (6) .4(3x-2)^2=32 x=(2±2√2)/3
(7) .(x-1)^2=9(2x+1)^2 , x-1=3(2x+1) ,x=-4/5
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