8.7+x=25 x÷0.3=2.7 48x+ 52x=45 5x-6.8+3.2=10
4.5+5=
0.36÷0.12=
0.03÷0.1=
1.25×0.8=
5.62-5.6=
0.2×0.3=
a-0.8a =
0.9x+0.1x=