1-3×(-2)+(-4)×(-5)=27
The reciprocal of 7, -2 and 2/5 is -65438+5/02.
The reciprocal of -2.5 is -2/5.
Calculation:
( 1) (-2)×5/4×(-9/ 10)×(-2/3)
=(-5/2)×(-9/ 10)×(-2/3)
=9/4×(-2/3)
=-3/2
=- 1.5
(2)(-6)×5×(-7/6)×2/7
=(-6)×(-7/6)×2/7×5
=7×2/7×5
=2×5
= 10