18*222.2-666.6怎样简便计算
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18*222.2-666.6怎样简便计算18*222.2-666.6怎样简便计算18*222.2-666.6怎样简便计算18*222.2-666.6=18x222.2-3x222.2=(18-3)x2
18*222.2-666.6怎样简便计算
18*222.2-666.6怎样简便计算
18*222.2-666.6怎样简便计算
18*222.2-666.6
=18x222.2-3x222.2
=(18-3)x222.2
=15x222.2
=3x5x222.2
=3x1111
=3333
18*222.2-666.6
=18*222.2-3*222.2
=222.2*（18-3）
=222.2*15
=222.2*（10+5）
=222.2*10+222.2*5
=2222+1111
=3333