Jaką liczbą jest x?
a) x + 9,6= 17 1/4
b) 6,75 - x = 2 11/12
c) x - 5 5/6 = 2,8
d) 4/7 * x = 1,6
e) x : 5,25 = 1 13/15
f) 6,4 : x = 16
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a)
x + 9,6= 17 1/4
x + 9,6= 17,25 ---------> bo 1/4 = 0,25
x = 17,25 - 9,6
x = 7,65
b)
6,75 - x = 2 11/12
6 3/4 - x = 2 11/12 --------> bo 0,75 = 3/4
-x = 2 11/12 - 6 3/4
x = 6 3/4 - 2 11/12
x = 6 9/12 - 2 11/12
x = 81/12 - 35/12
x = 46/12
x = 3 10/12
c)
x - 5 5/6 = 2,8 ---------> bo 0,8 = 8/10
x - 5 5/6 = 2 8/10
x = 2 8/10 + 5 5/6
x = 2 48/60 + 5 50/60
x = 8 38/60
x = 8 19/30
d) 4/7 * x = 1,6 -------> obustronnie dzielimy przez 4/7
x = 1,6:4/7
x = 16/10 : 4/7
x = 16/10 * 7/4
x = 112/40 --------> bo 112/40 = 2 32/40 = 2 8/10
x = 2,8
e) x : 5,25 = 1 13/15
x : 5 1/4 = 1 13/15
x = 1 13/15 * 5 1/4
x = 28/15 * 21/4
x = 588/60
x = 9,8
f) 6,4 : x = 16 --------> obustronnie dzielimy przez 6,4
x = 16 : 6,4
x = 2,5