Lupa: 5
d×d+5=21
d²=21-5=16
d=4
Długopisy×długopisy+x=84
4×4+x=84
2x=84-16
2x=58
x=29
4+2×5×29=4+10×29=4+290=294
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Lupa: 5
d×d+5=21
d²=21-5=16
d=4
Długopisy×długopisy+x=84
4×4+x=84
2x=84-16
2x=58
x=29
4+2×5×29=4+10×29=4+290=294