Toán Lớp 5: tìm x: 71+65=x+140 phần x +260
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Toán Lớp 5: tìm x: 71+65=x+140 phần x +260
Comments ( 2 )
71 + 65=$\dfrac{x+140}{x}$ + 260
$\dfrac{x+140}{x}$=71 + 65 + 260
$\dfrac{x+140}{x}$=396
$\dfrac{x}{x}$ + $\dfrac{140}{x}$=396
1 + $\dfrac{140}{x}$=396
$\dfrac{140}{x}$=396 – 1
$\dfrac{140}{x}$=395
x=140 : 395=$\dfrac{28}{79}$