3.25×7,.8-7.8 =(3.25-1)×7.8=17.55(5x-4)÷5=45x-4=205x=24x=4.85x-3x1.3=05x=3.9x=0.78(x+0.5)×3=45x+0.5=15x=14.5
3.25×7,.8-7.8=(3.25-1)×7.8=17.55(5x-4)÷5=45x-4=205x=24x=4.85x-3x1.3=05x=3.9x=0.78(x+0.5)×3=45x+0.5=15x=14.5