简算：999×7.78+333×6.66≡ 5.97×2.6＋0.597×75－597×0.001
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5.97x2.6+0.597x75-597x0.001
=5.97x2.6+5.97x7.5-5.97x0.1
=5.97x(2.6+7.5-0.1)
=5.97x10
=59.7
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
=5.97x2.6+5.97x7.5-5.97x0.1
=5.97x(2.6+7.5-0.1)
=5.97x10
=59.7
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
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