Các câu hỏi tương tự
Tinh nhanh:
(100/3)+(100/3^2)+(100/3^3)+(100/3^4)
bai1:tinh tong S=1.3+3.5+5.7+...+99.101
bai2 :tinh tong S=1.4+4.7+7.10+...+2017.2020
bai 3: tinh tong N=2.4+4.6+6.8+..+100.102
bai 4: tinh tóng=2.6+6.10+10.14+14.18+...+42.46+50.54
bai 5:tinh tongB=2^2+4^2+6^2+...+100^2
bai 6:C=1^2+3^2+...+100^2
bai7: biet 1^2+2^2+3^2+...+10^2=385 tinh tong 2^2+4^2+6^2+...+20^2
bai 8: tinh tong s=1^2+2^2+3^2+...+99^2
Tinh nhanh
(100-1^2)(100-2^2)-(100-3^2)...(100-19^2)
tinh gia tri bieu thuc :A= [100-1].(100-2 ).[100-3]......[100-n]
Tinh:
A= (10^3-1}^1.(10^3-2)^2.(10^3-3)^3.........(10^3-100)^100
thuc hien phep tinh (100- 1 ) (100-2)..........(100-3)
A= 1*1+2*2+3*3+...+100*100
tinh tong A
Tinh nhanh
(100-12)(100-22)-(100-32)...(100-192)
Tinh:1/2+2/3+3/4+...+99/100