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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 5: bài 2 5dm2 21cm2 = …dm2 12dm2 3cm2=…dm2 247cm2 =…dm2 190000mm2= …dm2

Toán Lớp 5: bài 2
5dm2 21cm2 = …dm2
12dm2 3cm2=…dm2
247cm2 =…dm2
190000mm2= …dm2

Comments ( 2 )

  1. 5dm$^{2}$ 21cm$^{2}$ = 5,21dm$^{2}$
    12dm$^{2}$ 3cm$^{2}$ =12,03dm$^{2}$
    247cm$^{2}$ =2,47dm$^{2}$
    190000mm$^{2}$ = 19dm$^{2}$

  2. 5dm² 21cm² = 5,21dm²
    – Vì 1dm² = 100cm² nên 21 : 100 + 5 = 0,21 + 5 = 5,21dm²
    12dm² 3cm²= 12,03 dm²
    – Vì 1dm² = 100cm² nên 3 : 100 + 12= 0,03 + 12 = 12,03dm²
    247cm² = 2,47dm²
    – Vì 1dm² = 100cm² nên 247 : 100 = 2,47dm²
    190000mm² = 19dm²
    – Vì 1dm² = 10000mm² nên 190000mm² : 10000 = 19dm²

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222-9+11+12:2*14+14 = ? ( )