2.5×7.1×4
16.12×99+16.12
26×15.7+15.7×24
(2.275+0.725)×0.28
9.6×25
3.6×4.9+0.36×51
7.3×91.6+2.7×91.6
7.8÷0.25÷4
1.37×99
①(3618÷18-145)×20
②6÷ - ÷6
③(21+ )× +
④ ×[ ÷( - )]
⑤3.5×98+35×0.2