12x+3=8x x-7.5 x÷12<20 6x+2y=18 y÷8=0.5
0.8×0.5=
5.6÷0.7=
10×0.9=
5.4÷0.9=
5.1÷1.7=
8.6y-y=
4.7a+5.4a=
0.26×1000=