0.25×0.85×4=
(5.6×1.2+4.4×1.2)×2.5=
①
②
③
④
⑤
⑥54.3×1.8+54.3×0.3﹣54.3×0.1
4÷11= 5÷(12+3)= (15﹣8)÷19= 72= 7.6×6+2.4×6=
63= 1.53﹣0.5= 9.8+0.9= 1.56+3.44= 1.25×2×8=
3a+4a=(+)a 9.9a= a- a
a×2.5+ a×5.5=×( +) 2.5×(a+4)=×+×