55×8.2+1.8×5.5
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55×8.2+1.8×5.5
=55×2×4.1+0.9×2×5.5
=110×4.1+0.9×11
=11×41+0.9×10+0.9×1
=10×41+1×41+9+0.9
=410+41+9+0.9
=460.9
=55×2×4.1+0.9×2×5.5
=110×4.1+0.9×11
=11×41+0.9×10+0.9×1
=10×41+1×41+9+0.9
=410+41+9+0.9
=460.9
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