Toán Lớp 5: câu 1: Tìm x
8 x x +8 x 21,42=400
câu 2: Tìm x
x x 40-50,8=38,4
câu 3: Tìm x
100 : x +0,5 x 15,6 =0,5×115,6
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Toán Lớp 5: câu 1: Tìm x
8 x x +8 x 21,42=400
câu 2: Tìm x
x x 40-50,8=38,4
câu 3: Tìm x
100 : x +0,5 x 15,6 =0,5×115,6
Comments ( 2 )
Câu 1:
8 × x + 8 × 21,42 = 400
8 × (x + 21,42) = 400
x + 21,42 = 400 : 8
x + 21,42 = 50
x = 50 – 21,42
x = 28,58.
Câu 2:
x × 40 – 50,8 = 38,4
x × 40 = 38,4 + 50,8
x × 40 = 89,2
x = 89,2 : 40
x = 2,23.
Câu 3:
100 : x + 0,5 × 15,6 = 0,5 × 115,6
100 : x + 7,8 = 57,8
100 : x = 57,8 – 7,8
100 : x = 50
x = 100 : 50
x = 2.
\text{Câu 1 :}
$\text{8 $\times$ x + 8 $\times$ 21,42 = 400 }$
\text{x + 21,42 = 400 : 8}
\text{x + 21,42 = 50}
\text{x = 50 – 21,42}
\text{x = 28,58}
\text{Câu 2 :}
$\text{x }$$\times$ $\text{40 – 50,8 = 38,4}$
$\text{x }$ $\times$ $\text{40 = 38,4 + 50,8}$
$\text{x }$ $\text{40 = 89,2 }$
\text{x = 89,2 : 40}
\text{x = 2,23}
\text{Câu 3 :}
$\text{100 : x + 0,5 $\times$ 15,6 = 0,5 $\times$ 115,6}$
$\text{100 : x + 7,8 = 57,8}$
$\text{100 : x = 57,8 – 7,8}$
$\text{100 : x = 50}$
$\text{ x = 100 : 50}$
$\text{x = 2 }$