\(\frac{4}{3}\cdot7+\frac{5}{7}\cdot12+\frac{1}{12}\cdot13+\frac{7}{13}\cdot20+\frac{3}{20}\cdot23+\frac{9}{23}\cdot32\)
BẠN VIÊT THẾ NÀY THÌ MN DỄ HIỂU HƠN NHÉ
4/3×7 + 5/7×12 + 1/12×13 + 7/13×20 + 3/20×23
Nhờ trình bày giúp + giải thích nha
tính giá trị biểu thức sau :
4 /3x 7 + 5 / 7 x 12 + 1 / 12 x 13 + 7/ 13 x 20 + 3 / 20x 23
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
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+149+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39*100
Tính nhanh tổng:
a, S=1 - 1/5 +7/12 -9/20 + 11/30 - 13/42 + 15/56 + 19/90 - 21/110 + 23/132
b, P=21 * (4/1*3 - 8/3*5 + 12/5*7 - 16/7*9 + ... + 36/17*19 - 40/19*21 ( dấu * là dấu nhân nhé)
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=
tinh nhanh
\(\frac{4}{3\text{x}7}\)+ \(\frac{5}{7\text{x}12}\)+ \(\frac{1}{12\text{x}13}\)+ \(\frac{7}{13\text{x}20}\)+ \(\frac{3}{20\text{x}23}\)+ \(\frac{6}{23\text{x}29}\)
Tính nhanh
a) 31/23 - (7/32 + 8/23)
b) 38/45 - (8/45 - 17/51 - 3/11)
c)(1/3 + 12/67 + 13/41) - ( 79/67 - 28/41)
d) 1/5 + -1/6 + 1/7 + -1/8 + 1/9 + 1/8 + -1/7 + 1/6 + -1/5
A = 49 8/23 - (5 7/32 + 14 8/23
B =71 36/45 - 43 8/45 - 1 17/57
C = -3/7 × 5/9 + 4/9 × -3/7 + 2 3/7
D = ( 19 5/8 : 7/12 -13 1/4 : 7/12 ) ×4/5
E = 0,7×2 2/3 × 20×20×0,375 × 5/28
F = (9,75 × 21 3/7 + 39/4 × 18 4/7) × 15/78
H = ( 9 3030/808080 + 7 303030/484848 + 4,03
I = 10101× ( 5/111111+5/222222- 4/3×7×11×13×37 )
