7 又1/5×3.8+0.62×72=

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7 又1/5×3.8+0.62×72=
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7 又1/5×3.8+0.62×72=
7 又1/5×3.8+0.62×72=

7 又1/5×3.8+0.62×72=
= 36/5 x 19/5 + 31/50 x 72
= 684/25 + 2232/50
=1368/50 + 2232/50
=3600/50
=72