4.6×2.5=×
2.5×(1.38×0.4)=×(×)
2.64×10.1=×+×
1000×0.08=
0.78×20=
630×0.7=
0.4×3=
3.5×7=
0.01×5=
⑴1.25×7.9×0.8
⑵63÷(1.7+1.9)+4.8
⑶8.4×13.5﹣3.5×8.4
⑷9.2÷0.25÷0.4