第一 62×7.1+2.9,

=440.2+2.9,

=443.1；

第二4.2×0.25,

=（4+0.2）×0.25,

=4×0.25+0.2×0.25,

=1+0.05,

=1.05；

第三5.2×4.3+0.8×4.3,

=（5.2+0.8）×4.3,

=6×4.3,

=25.8．

第四8.5+1.5÷0.25×4,

=8.5+6×4,

=8.5+24,

=32.5．

第五0.25×0.8+2.5%

=0.2+2.5%,

=0.225；

第六32×125×2.5,

=4×8×125×2.5,

=8×125×（4×2.5）,

=1000×10,

=10000；

第七94÷（6.84×8.5-31.46÷0.55）,

=94÷（58.14-57.2）,

=94÷0.94,

=100．

第八13÷0.4÷2.5,

=13÷（0.4×2.5）,

=13÷1,

=13；

第九1.25×2.5×0.8,

=（1.25×0.8）×2.5,

=1×2.5,

=2.5；

第十1.5×101-1.5,

=1.5×（101-1）,

=1.5×100,

=150；