6.24×5.7+0.5×37.6巧算?
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6.24×5.7+ 0.57×37.6 =6.24×5.7 +5.7×3.76 =5.7x(6.24+3.76)=5.7x10 =57
咨询记录 · 回答于2022-12-31
6.24×5.7+0.5×37.6巧算?
6.24×5.7+ 0.57×37.6 =6.24×5.7 +5.7×3.76 =5.7x(6.24+3.76)=5.7x10 =57
所以上面的后半部分0.43×67=4.3×6.7 所以原来的整个式子就可以写成:5.7×6.7+4.3×6.7 =(5.7+4.3)×6.7 =10×6.7 =67