Simple calculation (1) 9999 * 2222-3333 * 6666 (2) 999 * 778 + 333 * 666 (3) 19.98 * 37-199.8 * 19 + 1998 * 082

（1）9999*2222-3333*6666
=3*3333*2222-3333*6666
=3333*6666-3333*6666
=0
（2） 999*778+333*666
=999*778+333*3*222
=999*778+999*222
=999*（778+222）
=999*1000
=999000
（3）19.98*37-199.8*19+1998*082
It's a mistake

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