Question

2/5÷3+4/5×1/3用脱式计算怎么算?22/2/5÷4+2/5×2/3

Answer 1

2/5÷3+4/5×1/3
=0.4/3+0.8/3
=0.4
22/2/5÷4+2/5×2/3
=2.2/4+0.4×2/3
=0.55+0.8/3
=0.82

Answer 2

2/5÷3+4/5×1/3
=2/5×1/3+4/5×1/3
＝1/3×（2/5＋4/5）
＝1/3×6/5
＝2/5
22/2/5÷4+2/5×2/3
=2.2÷4+0.4×2/3
=0.55+0.8/3
=（0.55×3）/3+0.8/3
＝1.65/3+0.8/3
＝2.45/3
＝0.816666666
≈0.82

Answer 3

原式=(2/5)×(1/3)+(4/5)×(1/3)
=(1/3)×(2/5 + 4/5)
=(1/3)×(6/5)
=2/5
另一题也是将除法变乘法，然后用乘法分配律计算。

Answer 4

2／5÷3＋4／5×1／3
＝2／5×1／3＋4／5×1／3
＝2／15＋4／15
＝2／5

Answer 5

2/5÷3+4/5x1/3
=2/5Ⅹ1/3+4/5x1/3
=1/3ⅹ(2/5+4/5)
=1/3Ⅹ6/5
=2/5