1×= 14×= ×= ×=
÷= 6÷= ÷4= ÷=
5÷(1+)= 4×0.5= 0.75×= 1﹣1×=
+×= 24÷= ×0.25= +=
10﹣= 1﹣×= ×6÷×6= 1÷×=
÷4= ×8= ÷0.4= 1.1×=
÷= ×= 0.52= 478÷83≈
①
②
③2.7-3x=
×16= 12÷= ×= 0×=
1÷= ÷= ÷= ×1.2=
7× = 75%+25%= = =
= ×0.15= 240×5%= =
×= ÷3= 0.16+= 3.5×=
×13÷×13= ×= ( ):=20
×62.5%= +×= ÷75%÷=
等量关系是。
方程是。