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6.6×28.4+3.3×43.2
=3.3×2×28.4+3.3×43.2
=3.3×56.8+3.3×43.2
=3.3×(56.8+43.2)
=3.3×100
=330
9.8+9.9+0.98
=10-0.2+10-0.1+0.98
=20-0.3+0.98
=20.68
=3.3×2×28.4+3.3×43.2
=3.3×56.8+3.3×43.2
=3.3×(56.8+43.2)
=3.3×100
=330
9.8+9.9+0.98
=10-0.2+10-0.1+0.98
=20-0.3+0.98
=20.68
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