In addition and subtraction of fractions and decimals mixed calculation formula ①3(7/8)-1.631;②10.06-1(5/6);③4.86-1(4/5);④1(3/4)-0.47+3 (1/3); ⑤4(2/5)-(1.67-1(3/5)), how many formulas should convert fractions into decimals for calculation?
在分数和小数加减混合运算算式①3(7/8)-1.631；②10.06-1(5/6)；③4.86-1(4/5)；④1(3/4)-0.47+3(1/3)；⑤4(2/5)-(1.67-1(3/5))中，应将分数化成小数进行计算的算式共有多少个
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<result>3</result>