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Calculati
A×b+c×d ,daca. A=b×5;b=d:2; c=d×2; d=7×8
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Răspuns :

d=7x8=56
c=56x2=112
b=56:2=28
a=28x5=140
axb+cxd=140x28+112x56=3920+6272=10192
a * b + c * d = 
a = 5b
d = 56
b = d : 2   =>  b = 56 : 2      b = 28
c = 2d      =>  c = 2 * 56      c = 112
a = 5 * 28               a = 140
a * b + c * d = 
140 * 28 + 112 * 56 =
3920 + 6272 = 
10192