2/3÷8+1/3×1/8(简便计算) 2/3X1/8十1/3x1/8=1/8(2/3+1/3)=1/8x1=1/8 (2+2/3)✘=7/9(解方程) 同时x9得9(2十2/3)x=7 18x+6x=7 24X=7 x=7/24
=1/8(2/3+1/3)=1/8解:9(2+2/3)x=7,(18+6)x=7,24x=7,x=7/24