4.55+0.45=
8.06+10=
10﹣3.75=
543﹣26﹣84=
12+8×9=
44×5=
125×80=
2.2+7.8﹣7.8+2.2=
3m2cm=m =(填小数)
□ □ □ □
千
百
十
个
●●●
●
●●●●
写作:
●●
①273﹣73﹣27
②1.25×9.78×80
③()×24
④[1﹣()]÷