Question

x+2.5=8.8	16.9÷x=0.13
x÷0.84=2.3	x-18.7=9.63

Answer 1

解：x+2.5=8.8   x+2.5-2.5=8.8-2.5                 x=6.3	解：16.9÷x=0.13                        x=16.9÷0.13                        x=130
解：x÷0.84=2.3                        x=2.3÷0.84                        x=1.932	解：x-18.7=9.63                      x=9.63+18.7                      x=28.33