6.7x7.2+2.8x4.5用简便方法
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6.7x7.2+2.8x4.5
=6.7×(7+0.2)+2.8×4.5
=46.9+1.34+2.8×4.5
=48.24+2.8×4.5
=48.24+(3-0.2)×4.5
=
咨询记录 · 回答于2021-11-07
6.7x7.2+2.8x4.5用简便方法
6.7x7.2+2.8x4.5=6.7×(7+0.2)+2.8×4.5=46.9+1.34+2.8×4.5=48.24+2.8×4.5=48.24+(3-0.2)×4.5=
=48.24+13.5-0.9=(48.24+13.5)-0.9=61.74-0.9=60.84
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