Toán Lớp 5: Bài 2: Tìm x:
a) 3/4 : x = 2/5 b) 3/4 + 1/4 : 4/5
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Toán Lớp 5: Bài 2: Tìm x:
a) 3/4 : x = 2/5 b) 3/4 + 1/4 : 4/5
Comments ( 2 )
a) $\frac{3}{4}$ : x = $\frac{2}{5}$
=> x=$\frac{3}{4}$ :$\frac{2}{5}$
=> x=$\frac{3}{4}$ x $\frac{5}{2}$
=>x=$\frac{15}{8}$
b) $\frac{3}{4}$ + $\frac{1}{4}$ : $\frac{4}{5}$
=$\frac{3}{4}$ +($\frac{1}{4}$ : $\frac{4}{5}$ )
=$\frac{3}{4}$ +($\frac{1}{4}$ x $\frac{5}{4}$ )
=$\frac{3}{4}$ +$\frac{5}{8}$
=$\frac{6}{8}$ +$\frac{5}{8}$
=$\frac{11}{8}$
Giải đáp:
a, 3/4 : x = 2/5
-> x = 3/4 : 2/5
-> x = 15/8
b, 3/4 + 1/4 : 4/5
= 17/16