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2.5x%x=10.5怎么解方程

①96%x-21%x=4.29 0.75x=4.29 0.75x÷0.75=4.29÷0.75 x=5.72②1.7-2.5x=0.45 1.7-2.5x+2.5x=0.45+2.5x 0.45+2.5x=1.70.45+2.5x-0.45=1.7-0.45 2.5x=1.25 2.5x÷2.5=1.25÷2.5 x=0.5③25%x+15%x=45 0.4x=0.8 0.4x÷0.4=0.8÷0.4 x=2

(1)9七% X-21% X=4.29, b5% X=4.29,b5% X÷b5%=4.29÷b5%, X=5.b2;(2)1.b-2.5X=0.45,1.b-2.5X+2.5X=0.45+2.5X, 1.b=0.45+2.5X, 1.b-0.45=0.45+2.5X-0.45, 1.25=2.5X, 1.25÷2.5=2.5X÷2.5, X=0.5.

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