M*N表示M的三倍剪去N的两倍.计算:(1)(5*4)*3 (2)X*(4*1)=7,求X
1个回答
(1)(5*4)*3
=(3×5-2×4)*3
=7*3
=3×7-2×3
=15
(2)X*(4*1)=7
X*(3×4-2)=7
X*10=7
3X-2×10=7
3X=27
X=9
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