Gọi 2 số cần tìm lần lượt là a và b

Theo đề bài, tổng 2 số là 12,5

Suy ra: a+b=12,5 (1)

Ta có, tổng của số thứ nhất nhân với 2,4 và số thứ 2 là 20,9

Suy ra: 2,4a+b=20,9 (2)

Giải (1) & (2), ta được: a=6 & b=6,5

Vậy 2 số cần tìm là 6 & 6.5

3/5m3 = 3/5x1 000 000cm3=600 000cm3

"Kết từ" là một thuật ngữ trong ngôn ngữ học và văn học, dùng để chỉ các từ hoặc cụm từ được sử dụng để liên kết các câu, các đoạn văn hoặc các ý tưởng lại với nhau, giúp văn bản trở nên mạch lạc và dễ hiểu hơn. Kết từ có thể bao gồm các từ nối, liên từ, trạng từ liên kết, hoặc các cụm từ chuyển tiếp.

1,5 = 1,5x100/100=150%

Gọi số tuổi của mẹ & con lần lượt là a,b (a,b€N*)

+Hiện nay mẹ hơn con 30 tuổi: a=b+30 (1)

+3 năm nữa số tuổi con bằng 2/7 số tuổi của mẹ: 2/7x(a+3)=b+3 (2)

Thay (1) vào (2), được: 2/7x(b+30+3)=b+3 => b=9(tm)

Vậy hiện nay con 9 tuổi

14m^2 10dm^2=1410dm^2

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