5.66÷1.015.66 0.728÷0.950.728 1.991.99÷1
3.25×0.93.25 1.8÷0.51.8×0.5 4.3734.3737…
59+46= 62-26= 43-27= 48+46=
157+140= 125+75= 400-98= 257-47=
142+108= 700-450= 210-50= 167+28=
(把)