1)6x+4(16-x)=84x=10(男生) 16-10=6(女生)2)(4+6)x2.5x1/2-4x2.5=7.53)答错一道题扣=5+2=7150-102=4242/7=6小华答对几道题15-6=94)3/8+1/9+1/6=3x9+8+12/72=47/721-47/72=25/72
