①9.8÷14 =0.7×14÷14=0.7
②（6.4＋3.2）÷8 =6.4÷8+3.2÷8=0.8+0.4=1.2
③ 35÷（0.35×4）=35÷0.35÷4=100÷4=25
④63.2×0.1＋6.32×9=6.32×1+6.32×9=6.32 ×(1+9) =6.32 ×10=63.2