84×9.9+8.4×1简便计算
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原式=8.4x99+8.4x1 =8.4x(99+1)=8.4x100=840
咨询记录 · 回答于2023-01-09
84×9.9+8.4×1简便计算
84乘九点9+8点4×1,简便计算
怎么写?
原式=8.4x99+8.4x1 =8.4x(99+1)=8.4x100=840
谢谢您
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解析:运用恒等变形,把84×9.9变成8.4x99
你倒是和我说话呀,你给我快点,小心我弄你
9.7乘101减9.7简便计算
9.7x101-9.7=9.7x(101-1)=9.7x100=970
以上题目都是恒等变形后,提取公因式,从而让计算得到简化