15+6÷(-3)×1/2
=15-2×1/2
=15-1
=14
(1/4-1/2+1/6)×24
=1/4×24-1/2×24+1/6×24
=6-12+4
=-2
1,15+6÷(-3)×1/2
=15十(一2)X1/2=15十(一1)=14
2、(1/4-1/2+1/6)×24二1/4X24一1/2X24十1/6×24=6一12十4=一2
15+6÷(-3)×1╱2
=15+(-2)×1╱2
=15+(一|)
=14
(1/4一1/2十1/6)x24
=(3/12一6/12十2/12)x24
=一1/12x24
=一2