5) a) 7/6 + 8/3 - 2 1/2 =
= 7/6 + 8/3 - 25/12
= (14 + 32 - 25)/12
= 21/12
= 7/4
= 1 3/4
b) 3/10 + 7/4 - 1 4/5 =
= 3/10 + 7/4 - 9/5
= (6 + 35 - 36)/20
= 5/20
= 1/4
c) 11/6 - 1 7/12 + 3/8 =
= 11/6 - 19/12 + 3/8
= (44 - 38 + 9)/24
= 15/24
= 5/8
d) 114/15 + 7/6 - 1 4/5 =
= 14/15 + 7/6 - 9/5
= (28 + 35 - 54)/30
= 9/30
= 3/10
e) 1 2/9 - 5/12 + 17/18 =
= 11/9 - 5/12 + 17/18
= (44 - 15 + 34)/36
= 63/36
= 7/4
= 1 3/4
f) il rezolvi singur pentru a exersa dupa modelele pe care ti le-am aratat
6) a) 1 1/4×6/7 : 15/28 =
= 5/4×6/7×28/15
= 6/7×7/3
= 6/3
= 2
b) 1 1/8 : 3/4×2/15 =
= 9/8×4/3×2/15
= 3/2×2/15
= 3/15
= 1/5
c) 20/27 : 5/9×3 3/7 =
= 20/27×9/5×24/7
= 4/3×24/7
= 32/7
d) 1 7/15×10/11 : 1 7/9 =
= 22/15×10/11×9/16
= 6/8
= 3/4
e) 2 11/12×9/5 : 7 7/8 =
= 35/12×9/5×8/63
= 7/3×2/7
= 2/3
f) il rezolvi singur pentru a exersa dupa modelele pe care ti le-am aratat
