1/4x(-8/9)= （-5/6)x(-3/10)= -34/15x25= (-0.3)x(-10/7)=
问题描述：
1/4x(-8/9)= （-5/6)x(-3/10)= -34/15x25= (-0.3)x(-10/7)=
答
1/4×(-8/9)
=-(1/4×8/9)
=-2/9
(-5/6)×(-3/10)
=5/6×3/10
=1/4
-34/15×25
=-(34/15×25)
=-170/3
(-0.3)×(-10/7)
=0.3×10/7
=3/7