Question

a×2×5:4=10 (a-64:8+6×4):5=5 dau coroana de aur plus 500 puncte​

Answer 1

a×2×5:4=10

a×10:4=10

a×10=10×4

a×10=40

a=40:10

a=4

(a-64:8+6×4):5=5

(a-8+24):5=5

a-8+24=5×5

a-8+24=25

a-8=25-24

a-8=1

a=8+1

a=9

Answer 2

Răspuns:

Explicație pas cu pas:

a × 2 × 5 : 4 = 10

a = 10 × 4 : 5 : 2 → aplic metoda mersului invers

a = 40 : 5 : 2

a = 8 : 2

a = 4

Verific:   4 × 2 × 5 : 4 = 40 : 4 = 10

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( a - 64 : 8 + 6 × 4 ) : 5 = 5

( a - 8 + 24 ) : 5 = 5

a - 8 + 24 = 5 × 5

a - 8 = 25 - 24

a - 8 = 1

a = 1 + 8

a = 9

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Verific :   ( 9 - 8 + 24 ) : 5 = 25 : 5 = 5