54+54=
49+49=
35+35=
62+62=
-6/35.-49/54
\(\dfrac{-6}{35}\cdot\dfrac{-49}{54}=\dfrac{6}{35}\cdot\dfrac{49}{54}=\dfrac{1}{9}\cdot\dfrac{7}{5}=\dfrac{7}{45}\)
-6/35 nhân -49/54 = mấy
Tính ( có đặt tính )
a. 38 762 + 49 363
b. 62 400 – 35 815
a. 38 762 + 49 363
+ 38762 49363 88125
b. 62 400 – 35 815
− 62400 35815 26585
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+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
1,Tính nhanh
a, 568 + 568 x 135 - 568 x 36
b, 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
c, 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
a, 568 + 568 x 135 - 568 x 36
= 568 x ( 1 + 135 - 36)
= 568 x 100
56 800
b, 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51)
= 54 x 100
= 5 400
c, 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= ( 2 x 35) x ( 7 x 5) + ( 10 x 7) x 25 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x ( 35 + 25 + 20)
= 70 x 80
= 5 600
a) 568 + 568 x 135 - 568 x 36
= 568 x ( 1+1+135-1-36 )
=568 x 100
=5680
b) 17 x 49 + 49 x 37 + 54 x 26 + 54 x 25
= 49 x ( 17 + 37 ) + 54 x ( 26 + 25 )
= 49 x 54 + 54 x 51
= 54 x ( 49 + 51 )
= 54 x 100
= 5400
c) 14 x 35 x 5 + 10 x 25 x 7 + 20 x 70
= 70 x 35 + 10 x 25 x 7+ 20 x 70
= 70 x 35 + 250 x 7 + 20 x 70
= 70 x 35 + 70 x 25 + 20 x 70
= 70 x (35+25+20)
= 70 x 80
= 5600
(a) UC(−32; 62) =
(b) UC(−35; −49) =
(c) BC(−8; 10) =
(d) BC(−18; −20) =
giúp mình nha mn :)
a, 35-{12-[-14+(-2)]}
b,49-(-54)-23
a) 35-{12-[-14-2]}=35-{12+14+2}=35-28=7
b)49+54-23=49+31=80
35 - {12-[(-14) + (-2)]}
= 35 - 12 + (-14) + (-2)
= 35 - (-14) + 12 - (-2)
= 35 - (-14) + 14
= 35 - 0
= 35
x-(-12)=(-8)+(-11)
Chọn kết quả đúng.
a) 40 + 20 – 6 = ?
A. 60 B. 54 C. 64
b) 43 – 8 + 17 = ?
A. 35 B. 62 C. 52
a ) 40 + 20 - 6 = 60 - 6 = 54
`->` B
b) 43 - 8 + 17 = 35 + 17 = 52
`->` C