4(90-x)=48 90-x=12x=78 5(x+2.4)=25.5x+2.4=5.1x=2.7(x-12)÷4=4.5x-12=18x=304.5x+x=23.15.5x=23.1x=4.2x-0.64x=17.280.36x =17.28x = 4812x+24x-15x=14721x=147 x=7
解下面方程4(90-x)=48 5(x+2.4)=25.5 (x-12)÷4=4.54.5x+x=23.1 x-0.64
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