(1/2-1/3-1/4+1/12)*(-24) (用分配率)
=-24×1/2+24×1/3+24×1/4-24×1/12
=-12+8+6-2
=0
第二个和第三个,把带分数变成分数就可以了
(-5/6)*(1又1/3)/(-1又2/3)
=-5/6×4/3÷(-5/3)
=5/6×4/3×3/5
=2/3
(1/2-1/3)/(-2/3)*1/3
=(1/2-1/3)×(-3/2)*1/3
=-1/2×(1/2-1/3)
=-1/2×1/6
=-1/12
(1/2-1/3-1/4+1/12)*(-24) (用分配率)
=-24×1/2+24×1/3+24×1/4-24×1/12
=-12+8+6-2
=0
第二个和第三个,把带分数变成分数就可以了
(-5/6)*(1又1/3)/(-1又2/3)
=-5/6×4/3÷(-5/3)
=5/6×4/3×3/5
=2/3
(1/2-1/3)/(-2/3)*1/3
=(1/2-1/3)×(-3/2)*1/3
=-1/2×(1/2-1/3)
=-1/2×1/6
=-1/12