21.5÷0.5×6
5.3×4.72+0.53×52.8
0.175÷0.25÷0.4
①2800÷25÷4
②125×27×8
③672÷[3×(201-194)]
④312×7+88×7
⑤358+479+42+121
⑥92×101-92
①7.25÷1.25÷8
②1.8×25+24÷1.5
③99×0.24+9.9×7.6
④0.175÷0.25×0.4
⑤3.74+0.625÷25
⑥0.68÷(5.2 -3.5)×1.25
①54×98
②(+﹣)×24
③4.86×[1÷(2.1﹣2.09)]
④8﹣