3/5+2/3x21/10 1-1/6÷4/7×3/8 15-2/15-2/15×4/3

3/5+2/3x21/10 1-1/6÷4/7×3/8
15-2/15-2/15×4/31/4÷(5/8+3/8×8/5) (1/3+3/4)÷5/12 (3/4-3/4×5/6)÷3/2 (要过程）

3/5+2/3x21/10
=0.6+1.4
=2
1-1/6÷4/7×3/8
=1-7/24*3/8
=1-7/64
=57/64
15-2/15-2/15×4/31/4÷(5/8+3/8×8/5)
=15-2/15-2/15*4/(31/4*49/40)
=15-2/15*[1+4*160/(31*49)]
=15-2/15*[1+640/1519]
=15-2/15*2159/1519
=15-4308/(15*1519)
=15-4308/22785
=14又18477/22785
(1/3+3/4)÷5/12
=13/12*12/5
=13/5
(3/4-3/4×5/6)÷3/2
=3/4*1/6*2/3
=1/12

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