\(\frac{34}{9}.\frac{49}{11}+\frac{71}{13}=\frac{1666}{99}+\frac{71}{13}=22,28982129\)
\(\frac{34}{9}.\frac{49}{11}+\frac{71}{13}=\frac{1666}{99}+\frac{71}{13}=22,28982129\)
tính nhanh:
A=3/34 x 10 1/12 x 8/9 x 2 1/8 x 3/13 x 26/37 x 1 9/11 x 3/4
tính 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+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50-999-888-777-666-555-444-333-222-111
nhanh nhé
a) 21/11 x 22/17 x 68/63
b) 5/14 x 7/13 x 26/25
c) 7/9 x 3/35 x 17/9
d) 11/17 : 33/34
e) 15,7 : 6,28
9 - 3 x ( X - 9 ) = 6
4 + 6 x ( X + 1 ) 70
\(\dfrac{X}{13}+\dfrac{15}{26}=\dfrac{46}{52}\)
\(\dfrac{11}{14}-\dfrac{3}{X}=\dfrac{5}{14}\)
5 x ( 3 + 7 x X ) = 40
X x 6 + 12 : 3 = 120
X x 3,7 + X x 6,3 = 120
( 15 x 24 - X ) : 0,25 = 100 : \(\dfrac{1}{4}\)
71 + 65 x 4 = \(\dfrac{X+140}{X}\)+ 260
( X +1 ) + ( X + 4 ) + ( x + 7 ) + ...... + (X + 28 ) = 155
đây là bài tìm X
tính nhanh
a, 50 x 24,5 + 49 x 24,5 + 24,5
b, 792,81 x 0,25 + 792,81 x 0,75 x ( 11 x 9 - 900 x 0,1 - 9 )
tính bằng cách thuận tiện nhất
a, 20,23 x 21 + 20,23 x 80 - 20,23
b, 5/13 x 7/11 + 5/13 x 2/11 + 8/13 x 9/11
X : 7 + 20 = 17 x 49 + 17 x 51 287 - ( X + 34) x 3 - 25 = 142 13 x X + 15 x X + 12 x X = 120
29 + 34 + 29 +66 + 71 + 45 + 56 + 11
Tính bằng cách thuận tiện nhất
a) \(\frac{11}{5}\)x \(\frac{40}{6}\)x \(\frac{36}{44}\)
b) \(\frac{13}{49}\)x \(\frac{14}{34}\)x \(\frac{17}{26}\)
c) \(\frac{4}{5}\) x \(\frac{8}{13}\)+ \(\frac{4}{5}\)x \(\frac{5}{13}\)