2/5×4×3/4 1/2×1/15+1/3×1/2 4/5×7/9×5/8 5/6×5/9+5/9×1/6 5/7×16×21/5 简便要写过程
2/5×4×3/41/2×1/15+1/3×1/24/5×7/9×5/85/6×5/9+5/9×1/65/7×16×21/5简便要写过程...
2/5×4×3/4 1/2×1/15+1/3×1/2 4/5×7/9×5/8 5/6×5/9+5/9×1/6 5/7×16×21/5 简便要写过程
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2/5×4×3/4
=(2*4*3)/(5*4)
=6/5
1/2×1/15+1/3×1/2
=1/2*(1/15+1/3)
=1/2*(1/15+5/15)
=1/2*6/15
=1*2*3/(2*3*5)
=1/5
4/5×7/9×5/8
=(4*7*5)/(5*9*8)
=7/18
5/6×5/9+5/9×1/6
=5/9*(5/6+1/6)
=5/9*1
=5/9
5/7×16×21/5
=(5*16*21)/(7*5)
=48
=(2*4*3)/(5*4)
=6/5
1/2×1/15+1/3×1/2
=1/2*(1/15+1/3)
=1/2*(1/15+5/15)
=1/2*6/15
=1*2*3/(2*3*5)
=1/5
4/5×7/9×5/8
=(4*7*5)/(5*9*8)
=7/18
5/6×5/9+5/9×1/6
=5/9*(5/6+1/6)
=5/9*1
=5/9
5/7×16×21/5
=(5*16*21)/(7*5)
=48
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