Question

80+(64:a+9)×6×5=380
800-702 -(86+X:4)=3

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Answer 1

Răspuns:

80+(64÷a+9)×6×5=380

64÷a+9×30=380-80

64÷a+9=300÷30

64÷a+9=10

64÷a=10-9

64÷a=1

a=64×1

a=64

800-702-(86+x ÷4)=3

98-(86+x÷4)=3

86+x÷4=98-3

86+x÷4=95

x÷4=95-86

x÷4=9

9=x÷4

x=9×4

x=36

Answer 2

$80+(64:a+9)\cdot6\cdot5=380|_{-80} \Rightarrow (64:a+9)\cdot30=300|_{:30} \Rightarrow 64:a+9=10|_{-9} \Rightarrow \\ \\ \Rightarrow 64:a=1 \Rightarrow a=64$