3.21✘8.2+87✘0.18+0.82✘54.9
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3.21×8.2+87×0.18+0.82×54.9=3.21×8.2+87×0.18+8.2×5.49=8.2×(3.21+5.49)+87×0.18=8.2×8.7+87×0.18=8.2×8.7+8.7×1.8=(8.2+1.8)×8.7=10×8.7=87
咨询记录 · 回答于2022-09-27
3.21✘8.2+87✘0.18+0.82✘54.9
3.21×8.2+87×0.18+0.82×54.9=3.21×8.2+87×0.18+8.2×5.49=8.2×(3.21+5.49)+87×0.18=8.2×8.7+87×0.18=8.2×8.7+8.7×1.8=(8.2+1.8)×8.7=10×8.7=87
好了,同学。
4.5✘2.9-5.6✘3.5+2.7✘5.4
这道题也要简便吗?