Question

6/50 Calculați:a.(5/6+3/4)•24/19;
b.(1/6+7/9)•18/17;
c.(5/6+7/8)•18/41+1/4;
d.(5/12-3/18)•4;
e.(11/45-1/30)•18/19;
f.(11/12-7/15)•10/9+1/2.
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Answer 1

Răspuns:

a) (5/6+3/4)×24/19

(10/12)×24/19=19/12×24/19=1/1×2/1=2/1=2

b)(1/6+7/9)×18/17

1/6+7×2/17=1/6+14/17=101/102

c)(5/6+7/8)×18/41+1/4

(20/24+21/24)×18/41+1/4

41/24×18/41+1/4

738/984+1/4

738/984+246/984

984/984

1

d)(5/12-3/18)×4

(15-6/36)×4

9/36×4

9/9

1

e)(11/45-1/30)×18/19

(2×11-3×1)/90×18/19

19/90×18/19

18/90

1/5

f) (11/12-7/15)×10/9+1/2

(55/60-28/60)×10/9+1/2

27/60×10/9+1/2

270/540+1/2

270/540+270/540

540/540

1