1.（7X-3X+5.9）/3=2.94x+5.9=8.74x=2.8x=0.72.144-6X=1.2/0.01144-6x=1206x=24x=43.0.8X除以2.25=4.80.8x/2.25=4.880x/225=4.880x=4.8*22580x=1080x=13.54.X+7.8=2（X+1.5）x+7.8=2x+3x=4.85.5（X-1）=（X=1）5x-5=...
1.（7X-3X+5.9）/3=2.9
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