999*7.78+333*6.66=?(要简算)

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999*7.78+333*6.66=?(要简算)999*7.78+333*6.66=?(要简算)999*7.78+333*6.66=?(要简算)999*7.78+333*6.66=999*7.78+3

999*7.78+333*6.66=?(要简算)
999*7.78+333*6.66=?(要简算)

999*7.78+333*6.66=?(要简算)
999*7.78+333*6.66
=999*7.78+333*3*2.22
=999*7.78+999*2.22
=999(7.78+2.22)
=999*10
=9990