oblicz i sprawdz :
1. 7 1/4 - x =5 2/3
2. 2* x =3 1/2
zamień na ułamek zwykły liczbę 2.5
proszę pomóżcie!
1).
7i1/4 -x = 5i2/3
29/4 -x = 17/3 /*12
87 - 12x = 68
-12x = 68 -87
-12x = -19 /:(-12)
x = 19/12
x = 1i7/12
spr.
L= 7i1/4 - x = 7i1/4 - 1i7/12 = 7i3/12 -1i7/12= 6i15/12 -1i7/12= 5i8/12= 5i2/3
P = 5i2/3
L = P
2).
2 *x = 3i1/2
2x = 3i1/2 /:2
x = 7/2 *1/2
x =7/4
L= 2*x = 2*7/4= 14/4 = 3i2/4= 3i1/2
P = 3i1/2
2,5 = 2i5/10= 2i1/2
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1).
7i1/4 -x = 5i2/3
29/4 -x = 17/3 /*12
87 - 12x = 68
-12x = 68 -87
-12x = -19 /:(-12)
x = 19/12
x = 1i7/12
spr.
L= 7i1/4 - x = 7i1/4 - 1i7/12 = 7i3/12 -1i7/12= 6i15/12 -1i7/12= 5i8/12= 5i2/3
P = 5i2/3
L = P
2).
2 *x = 3i1/2
2x = 3i1/2 /:2
x = 7/2 *1/2
x =7/4
spr.
L= 2*x = 2*7/4= 14/4 = 3i2/4= 3i1/2
P = 3i1/2
L = P
2,5 = 2i5/10= 2i1/2