tìm X : X+1/5 – 3/7=6/35 , b) Xx3-X/4 = 33, c) Xx4+X/3=39
tìm X : X+1/5 – 3/7=6/35 , b) Xx3-X/4 = 33, c) Xx4+X/3=39
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tìm X : X+1/5 – 3/7=6/35 , b) Xx3-X/4 = 33, c) Xx4+X/3=39
Dâu
Đáp án: a) x = 2/5
b) x = 12
c) x = 9
Giải thích các bước giải:
a) x + 1/5 – 3/7 = 6/35
=> x + 1/5 = 6/35 + 3/7
=> x + 1/5 = 6/35 + 15/35
=> x + 1/5 = 21/35
=> x + 1/5 = 3/5
=> x = 3/5 – 1/5 = 2/5
b) x . 3 – x/4 = 33
=> x . 3 – x . 1/4 = 33
=> x(3 – 1/4) = 33
=> x . 11/4 = 33
=> x = 33 : 11/4 = 33.4/11 = 12
c) x . 4 + x/3 = 39
=> x . 4 + x. 1/3 = 39
=> x(4 + 1/3) = 39
=> x . 13/3 = 39
=> x = 39 : 13/3 = 39.3/13 = 9
P/S : Dấu chấm là dấu nhân
Helga
Đáp án: