（54.36 ）×1.75-(50.36 )×4分之7
=(54.36-50.36)x1.75
=4x1.75
=7
4分之3×（54.36 ）+4分之3×（ 45.64 ）
=3/4x(54.36+45.64)
=3/4x100
=75
1.75 54.36 50.36 45.64 从上面这些数中选择合适的数,填在下面式子的（）中.使计算能简便,并计算.
（54.36 ）×1.75-(50.36 )×4分之7
=(54.36-50.36)x1.75
=4x1.75
=7
4分之3×（54.36 ）+4分之3×（ 45.64 ）
=3/4x(54.36+45.64)
=3/4x100
=75