Tìm x B)x+x:5+x×1/5=1/5

Toàn Diện Đẹp Hỏi từ APP VIETJACK

đã hỏi trong Lớp 4 Toán học

· 20:21 01/09/2022

Tìm x
B)x+x:5+x×1/5=1/5

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2 câu trả lời 326

Hoàng Linh

3 năm trước

Ta có:

$x + x \div 5 + x \times \frac{1}{5} = \frac{1}{5} x \times (1 + \frac{1}{5} + \frac{1}{5}) = \frac{1}{5} x \times (\frac{5}{5} + \frac{2}{5}) = \frac{1}{5} x \times \frac{7}{5} = \frac{1}{5} x = \frac{1}{5} \div \frac{7}{5} x = \frac{1}{5} \times \frac{5}{7} x = \frac{1}{7}$

1 bình luận

TuanRealMadrid · 3 năm trước

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Khuong NHN

3 năm trước

Giải : $x + \frac{x}{5} + \frac{x}{5} = \frac{1}{5} \to \frac{5 x + x + x}{5} = \frac{1}{5} \to 7 x = 1 \to x = \frac{1}{7}$