2.8x0.46+0.28x0.28x4.1+0.028x13
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2.8×0.46+0.28×4.1+0.028×13
=0.28×4.6+0.28×4.1+0.28×1.3
=0.28×(4.6+4.1+1.3)
=0.28×10
=2.8
=0.28×4.6+0.28×4.1+0.28×1.3
=0.28×(4.6+4.1+1.3)
=0.28×10
=2.8
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2.8x0.46+0.28x4.1+0.028x13
=2.8×0.46+2.8×0.41+2.8×0.13
=2.8×(0.46+0.41+0.13)
=2.8×1
=2.8
=2.8×0.46+2.8×0.41+2.8×0.13
=2.8×(0.46+0.41+0.13)
=2.8×1
=2.8
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