1. Luas permukaan = 2× (pl+pt+lt)
Luas permukaan = 2×((5×3) + (5×11) + (3×11))
Luas permukaan = 2×(15+55+33)
Luas permukaan = 2 × ( 15+88 )
Luas permukaan = 2×103
Luas permukaan = 206 cm
2). f(x) = 10x × x! + 3x²
f(9) = 10(9) × 9! + 3(9)²
f(9) = (10 × 9) × 9! + 3(9)²
f(9) = 90 × (9×8 × 7 ×6× 5 × 4 × 3 × 2) + 3(9)2
f(9) = 90 × 362.880 + 3(9 × 9)
f(9) = 90 × 362.880 + (3 × 81)
f(9) = 90 × 362.880 + 243
f(9) = 32.659.200 + 243
f(9) = 32.659.443 ✅
3). 2.810 × 2.010
= 5.648.100
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Penyelesaian
1. Luas permukaan = 2× (pl+pt+lt)
Luas permukaan = 2×((5×3) + (5×11) + (3×11))
Luas permukaan = 2×(15+55+33)
Luas permukaan = 2 × ( 15+88 )
Luas permukaan = 2×103
Luas permukaan = 206 cm
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2). f(x) = 10x × x! + 3x²
f(9) = 10(9) × 9! + 3(9)²
f(9) = (10 × 9) × 9! + 3(9)²
f(9) = 90 × (9×8 × 7 ×6× 5 × 4 × 3 × 2) + 3(9)2
f(9) = 90 × 362.880 + 3(9 × 9)
f(9) = 90 × 362.880 + (3 × 81)
f(9) = 90 × 362.880 + 243
f(9) = 32.659.200 + 243
f(9) = 32.659.443 ✅
___________________________
3). 2.810 × 2.010
= 5.648.100
___________________________