4.2*4.2+0.42*58+42
=4.2×4.2+4.2×5.8+42
=4.2×(4.2+5.8)+42
=4.2×10+42
=42+42
=84
4.2*4.2+0.42*58+42
=4.2*4.2+4.2*5.8 + 4.2*10
=4.2*(4.2+5.8+10)
=4.2*20
=84
4.2*4.2+0.42*58+42
=4.2*4.2+4.2*5.8+42
=4.2*(4.2+5.8)+42
=42+42
=84
4.2*4.2+0.42*58+42
=4.2*4.2+4.2*5.8+4.2*10
=4.2*(4.2+5.8+10)
=4.2*20
=84