7.91-0.85+2.09
23-0.34-1.66
54×0.25+7.5×5.4
940×[(345﹣255)÷18]
12.78+(3.9﹣2.22)
53×102
6000÷125÷8
25.6+2.97+4.4+5.03
335×15﹣15×235
①54×98
②(+﹣)×24
③4.86×[1÷(2.1﹣2.09)]
④8﹣