A simple algorithm of 0.4 × 2.5 + 0.07 × 50 It is a simple algorithm of 0.4 × 2.5 + 0.07 × 50

0.4×2.5＋0.07×50
=0.4×2.5＋1.4×2.5
=2.5×（0.4+1.4）
=2.5×1.8
=2.5×2×0.9
=5×0.9
=4.5

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