0.6+0.3=       1.2-0.4=       12.5-2.5=       7.9-0.9=    

1-0.6=       8.6-7=       3.12×100=      

99+68=      0.5+0.5=      1.2-0.3=      

10-0.8=      3.39+17.61=       1-0.84-0.16=      

7.4+（5.6-4）=      3-0.5+2.5=      24.3-（8.5+5.8）=      

10－0.09=      3.8＋0.12=      0.01＋0.1=      1.5×6+1.5×4=      

①

②72÷80%－100×75%

③  

④87.5%×16－(12×75%－4)

⑤125%×3.2×25%

⑥

6.8×32+32×3.2                                        8.9×10.1                                12.5×8.94×0.8

3.6×3.4+7.2×3.3                                        56.3÷0.125÷8                        3.4÷0.25