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2.5×4.7+5.2×0.75
=2.5×4.7+5.2×(0.3×2.5)
=2.5×4.7+(5.2×0.3)×2.5
=2.5×4.7+1.56×2.5
=2.5×(4.7+1.56)
=2.5×6.26
=15.65
=2.5×4.7+5.2×(0.3×2.5)
=2.5×4.7+(5.2×0.3)×2.5
=2.5×4.7+1.56×2.5
=2.5×(4.7+1.56)
=2.5×6.26
=15.65
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