(1)-3x<-15 解:两边同时除以-3得: x>5(2)2x+3>5 解:2x>5-3 x>1(3)2分之2+x≥3分之2x-1解:两边同时乘以6去分母得:3(2+x) ≥2(2x-1)6+3x≥4x-26+2≥4x-3xx≤8 (4)3分之x+5-2分之3x+2≥0解:两边同时乘以6去分母得:2(x+5)-3(3x+2)≥02x+10-9x-6≥0-7x+4≥0-7x≥-4x≤4/7