1樓:匿名使用者
7.5×2/5-2.5×2/5
=2/5×(7.5-2.5)
=2/5×5=2
簡便計算 7.5×3/5+2.5÷5/3 2/9÷[5/6×(
2樓:歡歡喜喜
1。 7.5x(3/5)+2.5除以(5/3)
=7.5x(3/5)+2.5x(3/5)
=(7.5+2.5)x(3/5)
=10x(3/5)
=6.2。 (2/9)除以[(5/6)x(4/5-2/3)]解: 因為 [(5/6)x(4/5-2/3)]除以(2/9)
=[(5/6)x(4/5-2/3)]x(9/2)=(9/2)x(5/6)x(4/5)-(9/2)x(5/6)x(2/3)
=3-5/2
=1/2
所以 (2/9)除以[(5/6)x(4/5-2/3)]=2.
3樓:糖寶
簡便計算
7.5×3/5+2.5÷5/3
= 7.5x3/5+2.5x3/5
= (7.5+2.5) x3/5
=10x3/5
=62/9÷[5/6×(4/5-2/3)]
=2/9÷[4/6-10/18]
=2/9÷[12/18-10/18]
=2/9x18/2=2
4樓:莫新華
7.5×3/5十2.5x3/5
(7.5十2.5)×3/5
|0x3/5二6
5樓:嶽麓風光
7.5×3/5+2.5÷5/3
=7.5×3/5+2.5×3/5
=(7.5+2.5)×3/5
=10×3/5
=62/9÷ [ 5/6×(4/5-2/3) ]=2/9÷ [ 5/6×(12/15-10/15) ]=2/9÷ [ 5/6×2/15 ]
=2/9×6/5×15/2=2
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