Đáp án:
$x=\dfrac{135}{14}=9,64...$
Giải thích các bước giải:
Sửa đề: $x:0,25+x*0,2=40,5$
$x:0,25+x*0,2=40,5$
$x:\dfrac{1}{4}+x*0,2=40,5$
$x*4+x*0,2=40,5$
$x*(4+0,2)=40,5$
$x*4,2=40,5$
$x=40,5:4,2$
Nếu đề là: x : 0,25 × 0,2 = 40,5
Cách giải: x : 0,25 = 40,5 : 0,2
x : 0,25 = 202,5
x = 202,5 × 0,25
x. = 50,625
Nếu đề là: x : 0,25 + 0,2 = 40,5
Cách giải: x : 0,25 = 40,5 - 0,2
x : 0,25 = 40,3
x = 40,3 × 0,25
x. = 10,075
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