6*4
=4x6-5x4
=4
(6*4)*2
=4*2
=4x4-5x2
=6
2*x
=4x2-5x
=8-5x
x*(2*x)
=x*(8-5x)
=4x-5(8-5x)
=29x-40
29x-40=18
29x=58
x=2
规定a*b=4a-5b,则(6*4)*2=?,x*(2*x)=18,x=?
规定a*b=4a-5b,则(6*4)*2=?,x*(2*x)=18,x=?
数学人气:984 ℃时间:2019-11-18 08:41:26
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