83+=25+
83+=25+ 39++24 =[+(76+24)
24×=15× 125×5×8×2=(×) ×(5×2)
(25+50) ×4=×4+50× (75×5)×=75×(×2)
1.8 3080030.8万
70g0.7kg 570cm5.70m
4.6km24603公顷
1-0.92= - = ×3.2= ÷ ×5=
3.5+4.28= × = ÷ = 99×0.9+0.9=