99×9/8×(-10/9)
=88×(-10/9)
=-5/396
(-99又49/48)×7
=-(100-49/1)×7
=-100×7+49/1×7
=-700+7/1
=-699又7/6
【-12/7+4/3-(-18/5)】×(-36)
=-12/7×(-36)+4/3×(-36)-(-18/5)×(-36)
=21-27-10
-16
-24×(12/7-6/5-1)
=-24×12/7+24×6/5+24×1
=-14+20+24
=30
99×9/8×(-10/9)
=88×(-10/9)
=-5/396
(-99又49/48)×7
=-(100-49/1)×7
=-100×7+49/1×7
=-700+7/1
=-699又7/6
【-12/7+4/3-(-18/5)】×(-36)
=-12/7×(-36)+4/3×(-36)-(-18/5)×(-36)
=21-27-10
-16
-24×(12/7-6/5-1)
=-24×12/7+24×6/5+24×1
=-14+20+24
=30