4x=
3x﹣38=37
12﹣3.6= 12×0.5= 36×25%= ×6+=
+= ÷4= 0××5= 28÷1.25÷8=
83﹣57=
1﹣0.74=
=
0.25×40=
2.1× =
0.15÷0.5=
①1.9x﹣1.7x=80.4
② =
③5.6x﹣ x=4.8
④5x+ =