怎样简便怎样算“/”这个是除号 8x0.4x12.5x25% 5分之4+3分之2 /（6分之5—2

怎样简便怎样算“/”这个是除号 8x0.4x12.5x25% 5分之4+3分之2 /（6分之5—2

8x0.4x12.5x25%=8×0.4×12.5×0.25=（8×1.25）×（4×0.25）=10×1=10

5分之4+3分之2 /（6分之5—2分之1）= 4/5 + （2/3）/（5/6 -1/2）=4/5 +2*2/（5-1*3）=4/5+2=2又4/5

5分之3x6分之5+6分之1 / 3分之5=3/5 * 5/6 +1/6=1/2+1/6=2/3

（3分之2x0.75+2分之1）/ 10分之3=2/3 *3/4 +1/2=1/2 + 1/2=1

1.=(8x12.5)x(0.4x25%)=100x0.1=10。2.(原式一4/5)的倒数是(5/6一1/2)x3/2，它=5/6x3/2一1/2x3/2=1/2，原式=2/1+4/5=14/5。3.=3/5x5/6+5/6x1/3=(3/5+1/3)x5/6=7/9。4.=2/3x0.75x3/10+1/2x3/10=3/10。

8×0.4×12.5×25％
=8×12.5×0.4×0.25
=100×0.1
=10
4/5+2/3÷(5/6-1/2)
=4/5+2/3×3
=4/5+2
=2又4/5
3/5×5/6+1/6÷5/3
=1/2+1/10
=3/5
(2/3×0.75+1/2)÷3/10
=(2/3×3/4+1/2)×10/3
=10/3

8×0.4×12.5×25%
=(8×12.5)×(0.4×25%)
=100×0.1
=10
4/5+2/3÷（5/6-1/2）
=4/5+2/3×3
=0.8+2
=2.8
3/5×5/6+1/6 /÷5/3
=3/5×5/6+1/6×3/5
=3/5×(5/6+1/6)
=3/5×1
=3/5
（3分之2x0.75+2分之1）/ 10分之3追答8×0.4×12.5×25%
=(8×12.5)×(0.4×25%)
=100×0.1
=10
4/5+2/3÷（5/6-1/2）
=4/5+2/3×3
=0.8+2
=2.8
3/5×5/6+1/6 /÷5/3
=3/5×5/6+1/6×3/5
=3/5×(5/6+1/6)
=3/5×1
=3/5
(2/3×0.75+1/2)÷3/10
=(1/2+1/2)×10/3
=1×10/3
=3又1/3

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