Răspuns:
Explicație pas cu pas:
1)
Notez numarul cu ,,a"
SZU
248 -> numarul format din 8 unitati, 2 sute si 4 zeci
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a + 100 = 248
a = 248 - 100
a = 148 -> numarul cautat
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2)
Notez numarul cu ,,n"
n × 5 + 35 = 1000 : 10
n × 5 + 35 = 100
n × 5 = 100 - 35
n × 5 = 65
n = 65 : 5
n = 13 → numarul
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3)
2 × a = 82 - 56 + 18 : 9
2 × a = 26 + 2
2 × a = 28
a = 28 : 2
a = 14
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4 × a = 64 - 48 + 64 : 4
4 × a = 16 + 16
4 × a = 32
a = 32 : 4
a = 8 -> numarul
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3 × a = 93 - 42 + 45 : 3
3 × a = 51 + 15
3 × a = 66
a = 66 : 3
a = 22
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5 × a = 75 - 45 + 100 : 5
5 × a = 30 + 20
5 × a = 50
a = 50 : 5
a = 10
