化简(8x+5.4)-(3x-6.7)
4x-3.6-1.4x+25.2x·x·x+a+a+a4y-(2y-6)+43a·a·a+a+5-4.2
6x*(1.4-0.75+2.65)4m+3a+2a-1.5m6.4-y-2.8-3y
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