9×<55 8×<75 40>×6
120+280= 610-200= 1000+300=
444+222= 321+427= 68+982=
8.4-5.6= 1.25×0.08= ÷8=
4÷0.2= 50×4%= 7× ÷7× =
﹣0.5= +3= ×= 0.8×=
0.23+177%= 2.5×40= 1÷= ×÷×=