pliss Bantuannya dong caranya&jawabannya

1. 279 + 143=
300 + 100=
400
2.L = S²
= 34 x 34
=1.156
3.V = S³
=2.744 x 2.744 x 2.744
=20.661.046.784 cm
4. V = S³
= 17 x 17 x 17
=4.913 cm
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