Bài 1: tìm x biết a) 2/3 của x là:-150 b)x+30%=1,3 c)2/3+x=45% d)3 1/3x+16 e)8 2/3:x-10=-8 f)(2 4/5x -50):2/3=51 bài 2: a)(1/8+3/4):5/6+1/2 b)1/2+3/4-(3/4-4/5) c)2/3+1/3.(-4/9+5/9) d)2/5+3/5:(3/5+-2/3)-3 1/2 e)(2-5/12):3+17/36 f)(7/8-3/4).11/3-2/3 g)75%-1 1/2+0,5:5/12 h)(2+5/6):1 1/5+-7/12