tinh 38 x 27 x 3
81 x 57
6. 27/35 x 5/9 - 2/7 x -7/5
7. 10/13 x 13/5 + {-9/5} x 10/3
8. 100/27 x 9/20 + 40% x 5/3
9. 1,5 x 5/12 + 1/4 x 3/4
9: =3/2*5/12+3/16
=15/24+3/16
=5/8+3/16
=13/16
Tính nhanh :
a ) 43 x 27 + 93 x 43 + 57 x 61 x 59 x 57
b ) 64 x 6 + 81 x 4 + 17 x 6
43 x 27 + 93 x 43 + 57 x 61 + 59 x 57
= 43 x ( 27 + 93 ) + 57 x ( 61 + 59 )
= 43 x 120 + 57 x 120
= 120 x ( 43 + 57 )
= 120 x 100
= 1200
b) 64 x 6 + 81 x 4 + 17 x 6
= 6 x ( 64 + 17 ) + 81 x 4
= 6 x 81 + 81 x 4
= 81 x ( 6 + 4 )
= 81 x 10
= 810
A) =43 x (27+93)+57*(61+59)
=43*120+57*120
=120*(43+57)
=120*100
=12000
tinh nhanh 27 x 35 + 17 x 81 + 27 x 14
Tính nhanh 27 x 35 + 17 x 81 + 27 x 14
27 x 35 + 17 x 81 + 27 x 14
= 27 x ( 35 + 14 ) + 17 x 81
= 27 x 49 + 17 x 81
= 1323 + 1377
= 2700
1) Tính nhanh :
a) 8 x 17 x 125
c) 4 x 37 x 25
d) 43 x 27 + 93 x 43 + 57 x 81 + 69 x 57
e) 123456789 x 45 biết 12345679 x 9 = 111 111 111
7 x 17 x 125 = (8 x 125) x 17 = 1000 x 17 = 17000
4 x 37 x 25 = (25 x 4 ) x 7 = 100 x 7 = 700
43 x 27 + 93 x 43 + 57 x 81 + 69 x 57 = 43 x (27 + 93) + 57 x (81 +69) = 43 x 120 + 57 x 120 + 57x30 = 120 x (43 + 57) + 1710 = 12000 + 1710 = 13710
1) tinh hop ly
(81 x 19 + 81 x 27) : 81
giup cho mik bai nay voi
(81 . 19 + 81 . 27) : 81
= 81 . (19 + 27) : 81
= (81 : 81) . (19 + 27)
= 1 . 46
= 46
2x + x - 12 = 0
64 . 6 + 81 . 4 + 17 . 6
43 . 27 + 93 . 43 + 57 . 61 + 59 . 57
2x + x - 12 = 0
2x + x = 0 + 12
2x + x = 12
3x = 12
x= 12 : 3
x = 4
64 .6 + 81 . 4 + 17 . 6
= 6 . ( 64 + 17 ) + 81 . 4
= 6 . 91 + 81 . 4
= 546 + 324
= 870
43 . 27 + 93 . 43 + 57 . 61 + 59 . 57
= ngày mai giải tiếp, đi ngủ đã !!!-_-zzz
2x + x - 12 = 0
<=> 2x + 1x - 12 = 0
<=> 3x - 12 = 0
<=> 3x = 0 + 12
<=> 3x = 12
<=> x = 12 : 3
<=> x = 4
Vậy x = 4
64 . 6 + 81 . 4 + 17 . 6
= 64 . 6 + 17 . 6 + 81 . 4
= 6 . ( 64 + 17 ) + 81 . 4
= 6 . 81 + 81 . 4
= 81 . ( 6 + 4 )
= 81 . 10
= 810
43 . 27 + 93 . 43 + 57 . 61 + 59 . 57
= 43 . ( 27 + 93 ) + 57 . ( 61 + 59 )
= 43 . 129 + 57 . 120
= 120 . ( 43 + 57 )
= 120 . 100
= 12 000
tính: 38 * 27 *3
__________________
81 * 57
ta co 38*27*3/81*57=3078/4617 rut gon thanh 2/3
nho k cho mk nha
1. -2/9 x 15/17 + -2/9 x 2/17
2. -5/3 x 6/5 + -7/9 x 3/10
3. 15/20 x 7/5 + -9/7 x -6/4
4.-25/13 x 5/19 + -25/13 x 14/19
5 -7/13 x 13/5 + -9/7 x 5/3
6. 27/35 x 5/9 - 2/7 x -7/5
7. 10/13 x 13/5 + {-9/5} x 10/3
8. 100/27 x 9/20 + 40% x 5/3
9. 1,5 x 5/12 + 1/4 x 3/4
10. 2 1/2 x 7/5 + {-9/10} x 2/3
11. X + 45% = 2 1/2 -5/3
12. 80% + X = -5/2 + 3/4
13. 4/25 - X =-5/2 + -3/10
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
1: =-2/9(15/17+2/17)=-2/9
2: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
tinh
\(\frac{\text{2181 x 729 + 243 x 81 x 27}}{\text{3^2 x 9^2 x 243 +18 x 54 x 162 x 9 +723 x 729}}\)
KQ=1165795659
minh tinh may tinh ko sai dau
k cho minh nhe