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==36/5x19/5+31/50x72=684/25+2232/50=1368/50+223
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