(1)
20÷40×100%
=0.5×100%
=50%
(2)
40÷20×100%
=2×100%
=200%
(3)
﹙40-20﹚÷40×100%
=20÷40×100%
=0.5×100%
=50%
(4)
﹙40-20﹚÷20×100%
=20÷20×100%
=1×100%
=100%
(1)
20÷40×100%
=0.5×100%
=50%
(2)
40÷20×100%
=2×100%
=200%
(3)
﹙40-20﹚÷40×100%
=20÷40×100%
=0.5×100%
=50%
(4)
﹙40-20﹚÷20×100%
=20÷20×100%
=1×100%
=100%