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999×778+333×666

来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/07/03 11:41:22
999×778+333×666
20.09×37-200.9×1.9+2009×0.82
999×778+333×666
999×778+333×666 = 999×778+333× 3 ×222 = 999×778+999 ×222
= 999×(778+222 ) =999 × 1000 = 999000
20.09×37-200.9×1.9+2009×0.82 = 20.09×37-20.09×10×1.9+20.09×100×0.82
= 20.09 × (37 -19 + 82) = 20.09 × 100 = 2009
再问: 我都会了就在这一瞬间