(1)(-12.5)x(-6/7)x(-4)
=-50*6/7
=-300/7
(2)(-1/2)x(-2/3)x(-1.25)x(-1又1/3)x(-1.8)
=-1/3*5/4*4/3*9/5
=-1
(3)(-105又5/6)x(+12)
=-105*12-10
=-1270
(1)(-12.5)x(-6/7)x(-4)
=-50*6/7
=-300/7
(2)(-1/2)x(-2/3)x(-1.25)x(-1又1/3)x(-1.8)
=-1/3*5/4*4/3*9/5
=-1
(3)(-105又5/6)x(+12)
=-105*12-10
=-1270