\(\dfrac{22}{9}-\dfrac{10}{7}=\dfrac{154}{63}-\dfrac{90}{63}=\dfrac{64}{63}\)
\(\dfrac{22}{9}-\dfrac{10}{7}\\ =\dfrac{154}{63}-\dfrac{90}{63}\\ =\dfrac{64}{63}\)
\(\dfrac{22}{9}-\dfrac{10}{7}=\dfrac{154}{63}-\dfrac{90}{63}=\dfrac{64}{63}\)
\(\dfrac{22}{9}-\dfrac{10}{7}\\ =\dfrac{154}{63}-\dfrac{90}{63}\\ =\dfrac{64}{63}\)
1/2+3/6+5/10+7/14+9/18+11/22
6×7×8×9×10×11
22×20×18×16×14×12
1 × 2 + 2 × 3 +3 × 4 + 4 × 5 + 5 × 6 + 6 × 7 + 7 × 8 + 8 × 9 + 9 × 10 + 10 × 11 +11 ×12 + 12 ×13 + 13×14 + 14×15 + 15×16 + 16×17 +17×18 + 18×19 + 19×20 + 20×21 + 21×22 + 22×23 + 23×24 + 24×25 + 25×26
tính nhanh
1+3+5+7+9+11+13+15
2+4+6+8+10+12+14+16
1+4+7+10+13+16+16+22
1+5+9+13+17+21+25+29+33+37
cứu mình với.HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Tính bằng cách thuận tiện nhất :1/7+1/8+1/9+1/10+1/11+1/12+1/14+1/15+1/18+1/22+1/24+1/28+1/33
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30=
5, 72 + 7, 22 + 8, 72 + 10, 22 +...+ 32, 72 + 34, 22
5, 72 + 7, 22 + 8, 72 + 10, 22 + ...+ 32, 72 + 34, 22 = ?
a) 1/7+1/8+1/9+1/10+1/11+1/12+1/13+1/14+1/15+1/18+1/22+1/24+1/28+1/33