x÷8=4.2 57﹣x=39 2x+3x=7.5
1.2×7= 13.2×0.2= 0.001÷0.1= 18.7×0×4=
8÷5= 2.4×5= 420×0.05= 0÷2.5×4=
①x-3.4=2.42
②12.8÷x=1.6
③9x-7x=3.8
④23.6-x=9.15
⑤1+0.25x=1.68
⑥0.3x+4×0.8=3.83
5.6+x=8.8 2x+6x=9.6 6(x+1.2)=9