56*78,21*47怎样简便运算
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![56*78,21*47怎样简便运算](/uploads/image/z/16645-13-5.jpg?t=56%2A78%2C21%2A47%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97)
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56*78,21*47怎样简便运算
56*78,21*47怎样简便运算
56*78,21*47怎样简便运算
56x78
=(50+6)x(80-2)
=4000-100+480-12
=4368
21x47
=(20+1)x(50-3)
=1000-60+50-3
=987