Răspuns:
Explicație pas cu pas:
3.
a ___ ___ ___ ___ ___
b ___
a - b = 96
4 parti egale = 96
96 : 4 = 24
b = 24
a = 5*24 = 120
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4.
(54 + 69)*2 + 1237 = 43*a + 1354
123*2 + 1237 = 43*a + 1354
246 + 1237 = 43*a + 1354
1483 = 43*a + 1354
43*a = 1483 - 1354
43*a = 129
a = 129 : 43 = 3
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5.
P = 2 x (L + l) = 50 m
L + l = 50 : 2 = 25 m
l ________
L ________+ 5 m
2 parti egale + 5 m = 25 m
2 parti egale = 25 m - 5 m = 20 m
20 m : 2 = 10 m (1 parte)
l = 10 m
L = 10 m + 5 m = 15 m
A = L x l = 15 m x 10 m = 150 m^2
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6.
Mihai ___ ___ ___ ___ ___ ___ ___ ___ ___ ___
Mihaela ___ ___ ___ ___ ___ ___ ___
3 parti egale = 30 lei
30 : 3 = 10 lei (1 parte)
Mihai are 10 x 10 = 100 lei
Mihaela are 7 x 10 = 70 lei
