tính nhanh 4*5*66-8*70+24*45-56*90
mik cần gấp
tính nhanh
1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132
Tính nhanh:
1/20 + 1/30 + 1/42 + 1/56 + 1/72 + 1/90 + 1/110 + 1/132
Tính nhanh:
a)\(\frac{5}{30}+\frac{15}{90}+\frac{25}{150}+\frac{35}{210}+\frac{45}{270}\)
b)\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{56}\)
c)\(\frac{1}{15}+\frac{4}{30}+\frac{2}{45}+\frac{16}{60}+\frac{25}{75}+\frac{36}{90}+\frac{49}{105}+\frac{64}{120}+\frac{81}{135}\)
Tính nhanh 1/2 + 5/6 + 19/20 + 29/30 + 41/42 + 55/56 + 71/71 + 89/90
tính nhanh:3/12+3/20+3/30+3/42+3/56+3/72+3/90+3/110
Tính nhanh:
1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 41/42 + 55/56 + 71/72 + 89/90
Tính nhanh :
a. 5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90
b. 1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90+109/110
GIÚP MK VỚI AI NHANH MK TICK
Tính nhanh 1/90:0,25 +1/90:0,2 +1/90 :0,5 +1/90:0,125-1/90 :0,1