Tinh nhanh:
----- Nội dung dịch tự động từ ảnh -----
Bài 5: Tính nhẫm:
a) \((-1 - x) \times \left( -\frac{1}{2} \right) \times \left( -\frac{1}{3} \right) \times \left( -\frac{1}{4} \right) \times \left( -\frac{1}{5} \right)\)
b) \(\left( 1 - 3 \right) \times \left( 1 - 4 \right) \times \left( 1 - 5 \right)\)
\(\left( 1 - 7 \right) \times \left( 1 - 10 \right)\)
\(\left( 1 - 13 \right) \times \cdots \times \left( 1 - 97 \right) \times \left( 1 - 100 \right)\)
Bài 5: Tính nhẫm:
a) \((-1 - x) \times \left( -\frac{1}{2} \right) \times \left( -\frac{1}{3} \right) \times \left( -\frac{1}{4} \right) \times \left( -\frac{1}{5} \right)\)
b) \(\left( 1 - 3 \right) \times \left( 1 - 4 \right) \times \left( 1 - 5 \right)\)
\(\left( 1 - 7 \right) \times \left( 1 - 10 \right)\)
\(\left( 1 - 13 \right) \times \cdots \times \left( 1 - 97 \right) \times \left( 1 - 100 \right)\)