92×68简便算式怎么写

(1)93x3/92=（92+1）*3/92=3+3/92=3又3/92(2)1/4x32x5/6x4/7=1/4*4/7*32*5/6=1/7*（80/3）=80/21(3)1/8x24x2/3x3/8=2*3/8=3/4(4)18x(5/6－2/9)=15-4