Các câu hỏi tương tự
420 - 220 + 620 / 620 - 320+ 920
2×3+3×4+4×5+5×6+6×7+...+19×20
1/2*4 1/4*6 1/6*8 .... 1/20*22 1/22*24
7/4 - x . 3/4 = 5/19
x : 5/4 = 5/19
[ x + 3/4 ] . 5/7 = 10/9
12/5 : x + 4/3 = 3 2/3
x. 4/5 : 2 = 6/7
x + 20/11.13 + 20/13.15 + 20/15 . 17 + ... + 20/53.55 = 2/4
Tính nhanh:
a,1/4+2/5+6/8+9/15+8/1
b,1/2+2/4+3/6+4/8+5/10+6/12+7/14+8/16+9/18+10/20
c,1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
Tính nhanh:
a,1/4+2/5+6/8+9/15+8/1
b,1/2+2/4+3/6+4/8+5/10+6/12+7/14+8/16+9/18+10/20
c,1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
Tính nhanh
1 * 3 * 5 + 2 * 6 * 10 + 4 * 12 * 20 / 1 * 5 * 7 + 2 * 10 * 14 + 4 * 20 * 28
so sánh
1 * 3 * 5/1 * 5 * 7 + 2 * 6 * 10/2 * 10 * 14 + 4 * 12 * 20/4 * 20 * 28 và 3/8
1+2+3+4 +...+2023
20+21+22+...+2024
2+4+6+...+2024
1+2+4+8+16+....+ 8192