7.8*1990+78简便计算怎么算?
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7.8*1990+78简便计算怎么算?
7.8*1990+78简便计算怎么算?
7.8*1990+78简便计算怎么算?
7.8 × 1990 + 78
= 7.8 × 1990 + 7.8 × 10
= 7.8 × (1990 + 10)
= 7.8 × 2000
= 15600
7.8*1990+78
=7.8*1990+7.8*10
=7.8*(1990+10)
=7.8*2000
=15600