4分之3×16+4分之3×5-4分之3
=4分之3×(16+5-1)
=4分之3×20
=15
30.6-(18.6+12×4分之3)
=30.6-(18.6+9)
=30.6-18.6-9
=12-9
=3
4/7*4/21x=8/9
3x=8/9
x=8/27
4分之3×16+4分之3×5-4分之3
=4分之3×(16+5-1)
=4分之3×20
=15
30.6-(18.6+12×4分之3)
=30.6-(18.6+9)
=30.6-18.6-9
=12-9
=3
4/7*4/21x=8/9
3x=8/9
x=8/27