1⼀8×[1⼀2÷(3⼀5×10⼀9)]×(1+1⼀2)×(1-1⼀2)×(1+1⼀3)×(1-1⼀3)×………×(1+1⼀9)×(1-1⼀9)求解及思

2025-01-07 15:47:43
推荐回答(2个)
回答1:

你好:

1/8×[1/2÷(3/5×10/9)]×(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×………×(1+1/9)×(1-1/9)
=1/8×[1/2÷3/5÷10/9]×(1+1/2)×(1+1/3)×(1+1/4)×……×(1+1/9)×(1-1/2)×(1-1/3)×(1-1/4)×……×(1-1/9)
=1/8×[1/2×5/3×9/10]×3/2×4/3×5/4×……×10/9×1/2×2/3×3/4×4/5×……×8/9
=1/8×3/4×5×1/9
=5/96

回答2:

1/8×[1/2÷(3/5×10/9)]×(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×………×(1+1/9)×(1-1/9)
=1/8×【1/2÷2/3】×(1+1/2)×(1+1/3)×……×(1+1/9)×(1-1/2)×(1-1/3)×……×(1-1/9)
=1/8×3/4×3/2×4/3×……×10/9×1/2×2/3×……×8/9
=3/32×10/2×1/9
=5/96