5=□+□ 5=□+□ 5=□+□ 5=□+□
9+1+5= 9+1+8= 9+1+6= 8+2+1=
9+6= 9+9= 9+7= 8+3=
①14.56﹣6.62+5.44﹣8.38
②×0.8×12.5
③5.9×63+59×3.7
④÷[×(﹣)]