x÷0.2=7.2 △2x-3.42=6.4
138-x=57 4x+6x=18
0.4×0.8= 5.6÷0.7= 0.8﹣0.26= 0.58×100=
0.52= 43= 0.33= 2.5×4÷2.5×4=
x+18-25=43 27x+31x=145 7x-16×4=27
6×0.8+7x=19.5 x-0.8x=10 3.6x÷2=2.16