『壹』 六年級數學計算專項練習..
1,①8/15:8/25 =8/15×25/8=5/3;②0.84:4/5=84/100×5/4=21/20;2,①3/10:0.625 =3/10×1000/625=12/25=12∶;②0.44:1.2=44/100×10/12=11/30=11∶303.①5/12÷[(5/6-2/3)×6] =5/12×(1/6×6)=5/12;②(4-2.4)÷8/25 =16/10×25/8=5;③(5/6+2/9)×0.8÷19/20=19/18×8/10×20/19=8/9;4,①4又3分之一+3.2+5又3分支2+6.8=4+1/3+5+2/3+3.2+6.8=20;②42×(1/2+1/3+1/7)=42×1/2+42×1/3+42×1/7=21+14+6=41;③31×29/30-29/30=(30+1)29/30-29/30=(30+1-1)29/30=29; ④27/43÷3/4+16/43÷3/4=27/43×4/3+16/43×4/3=4/3(27/43+16/43)=4/3;⑤88×25/87=(87+1)×25/87=87×25/87+25/87=25又87分之25;⑥1-1/6-1/12-1/20-1/30-1/42=1-[(1/6+1/12)+(1/20+1/30)+1/42]=1-(1/4+1/12+1/42)=9/14;5,①X-1/4X=3/4 ;