2x+1.6=12.4 7.6x-7x=3.6
25.6÷0.25÷4 (3.2+0.56)÷0.8
20.16÷1.5÷2.4 (2.3÷0.46-4.5)÷0.25
0÷19.8= 0.2×0.05= 0.6×1.5= 1.36+2.87+3.64=