5×÷3=1.55×=4.5×=0.9
5x÷3=1.55x=3X1.5x=4.5÷5x=0.9
5x÷3=1.55x=3*1.55x=4.5x=0.9检验5*0.9÷3=4.5÷3=1.5左边=右边
5x÷3=1.55x=3×1.5=4.5x=4.5÷5=0.9