如题所述
(4×0.8+4×2.5+0.8×2.5)×2
=(4×0.8+4×2.5+4×0.5)×2
=(0.8+2.5+0.5)×4×2
=3.8×4×2
=15.2×2
=30.4
=(4×0.8+4×2.5+4×0.5)×2
=(0.8+2.5+0.5)×4×2
=3.8×4×2
=15.2×2
=30.4
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第1个回答 2020-09-06
(4×0.8+4×2.5+0.8×2.5)
×2
=(3.2+10+2)×2
=15.2×2
=30.
×2
=(3.2+10+2)×2
=15.2×2
=30.