5t+2t= a-0.8a= 5t-2t= 7a-6a= a+0.5a= 2x+2x= 2x*2x= a*5a= 8a+
2个回答
2X+2X=2X*2X
4X=4X*X
X=1
X-0.25X=0.75
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