24×(-17)+24×(-9)
=24×【(-17)+(-9)】
=24×(-26)
=-624
(7/9-5/6+3/4/-7/18)×36,
=7/9×36-5/6×36+3/4×36-7/18×36
=28-30+27-14
=11
(-3/5)×(-12)+0.27×5/9+(-12)×(-2/5)+4/9×0.27
=(-3/5)×(-12)+(-12)×(-2/5)+0.27×5/9+4/9×0.27
=(-12)×【(-3/5)+(-2/5】+0.27×(5/9+4/9)
=(-12)×(-1)+0.27×1
=12+0.27
=12.27