①1.25×3.9×0.8
②63.4÷2.5÷0.4
③0.8×6.8﹣0.8×3.8
④202×0.15.
3.12×0.5=×
6.9×4.5+3.1×4.5=(+)×4.5
0.25×7.8×4=7.8×(×)
0.8×0.94×12.5=
×
+
÷6 =;
+8×
)÷
=
①4.5-3.5×0.8
②0.8×3.7×1.25
③6.4×3.7+6.4×6.3
-
-
-
①46×101-46
②254-36+145-44
③0.72+2.8+1.28+7.2
④33.45-(3.45+9.72)
⑤125×32×25
⑥1400÷25÷4
①6.28÷0.8÷5
②6.4+0.74+3.7+0.26
③2.5×(40-4)
④(8+0.8)×12.5
⑤33.5-3.5×6
⑥17÷[(1.2+0.8)×5]
①1.25×0.73×0.8
②4.37×0.55+5.63×0.55
③0.25×4÷0.25×4
④63.4÷2.5÷4
⑤10-6.48÷1.8
⑥2.1×[(4.5+1.5)÷0.05]
① 
② 
③ 
④ 
⑤ 
⑥3.2×0.25×125%
①11.5×8.7-11.5×6.7
②3.2×0.25
③0.72×101
④8.8×39+8.8
⑤7.6×2.4+2.4×2.4
①22.96÷0.8-8.6
②0.7×8×1.25×0.9
③(2.34+4.77)÷(0.15×6)
④5.4×(2.8÷2.24)
⑤22.4×8.5+8.5×7.6
⑥7.02-0.56÷0.4