tính nhanh
225 x 17 - 17 x 125 125 x 57 x 8
x³ =125
4⁵:4³=
8¹² . 8³ : 8¹⁵=
7¹⁵ : 7¹³=
17¹⁵. 17¹⁰: 17²²=
5¹⁰ . 25 : 5¹¹=
15¹⁰ .225 : 15¹¹=
`@` `\text {Ans}`
`\downarrow`
`x^3 = 125`
`=> x^3 = 5^3`
`=> x = 5`
Vậy, `x = 5`
_____
`4^5 \div 4^3`
`=`\(4^{5-3}\)
`= 4^2`
______
\(8^{12}\cdot8^3\div8^{15}\)
`=`\(8^{12+3-15}\)
`=`\(8^0=1\)
______
\(7^{15}\div7^{13}\)
`=`\(7^{15-13}\)
`=`\(7^2\)
_______
\(17^{15}\cdot17^{10}\div17^{22}\)
`=`\(17^{15+10-22}\)
`= 17^3`
_______
\(5^{10}\cdot25\div5^{11}\)
`=`\(5^{10}\cdot5^2\div5^{11}\)
`=`\(5^{10+2-11}\)
`= 5`
_______
\(15^{10}\cdot225\div15^{11}\)
`=`\(15^{10}\cdot15^2\div15^{11}\)
`=`\(15^{12}\div15^{11}\)
`= 15`
`@` `\text {Kaizuu lv uuu}`
\(x^3=125\)
\(\Rightarrow x^3=5^3\)
\(\Rightarrow x=3\)
___________________
\(4^5:4^3\)
\(=4^{5-3}\)
\(=4^2=16\)
___________________
\(8^{12}.8^3:8^{15}\)
\(=8^{15}:8^{15}\)
\(=1\)
___________________
\(7^{15}:7^{13}\)
\(=7^{15-13}\)
\(=7^2=49\)
___________________
\(17^{15}.17^{10}:17^{22}\)
\(=17^{25}:17^{22}\)
\(=17^3=4913\)
___________________
\(5^{10}.25:5^{11}\)
\(=5^{10}.5^2:5^{11}\)
\(=5^{12}:5^{11}\)
\(=5^1=5\)
___________________
\(15^{10}.225:15^{11}\)
\(=15^{10}.15^2:15^{11}\)
\(=15^{12}:15^{11}\)
\(=15^1=15\)
__________________
* an . am = an+m
an : am = an-m
Chúc bạn học tốt
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
Tính bằng cách hợp lý :
a) 126 x 22 + 78 x 126
b) 225 x 17 - 17 x 125
a) 126 x 22 + 78 x 126 = 126 x ( 22 + 78 )
= 126 x 100
= 12600.
b) 225 x 17 - 17 x 125 = ( 225 - 125 ) x 17
= 100 x 17
= 1700.
a) 126 x 22 + 78 x 126 = 126 x ( 22 + 78 )
= 126 x 100
= 12600.
b) 225 x 17 - 17 x 125 = ( 225 - 125 ) x 17
= 100 x 17
= 1700
k mk nha
a)126 x 22 + 78 x 126 = 126 x (22 + 78)
= 126 x 100
= 12600
b)225 x 17 - 17 x 225 = 225 x (17 - 17)
= 225 x 0
= 0
8. Bỏ dấu ngoặc rồi tính:
a) ( 17 – 229) + ( 17 - 25 + 229) ; b) ( 125 – 679 + 145) – ( 125 – 679 )
9. Tìm x biết: a) 15 – ( 4 – x) = 6 ; b) - 30 + ( 25 – x) = - 1 ;
c) x – ( 12 – 25) = -8 ; d) ( x – 29 ) – ( 17 – 38 ) = - 9
10. Tìm số nguyên x biết: a) x – 5 = - 1 ; b) x + 30 = - 4; c) x – ( - 24) = 3 ; d) 22 – ( - x ) = 12; e) ( x + 5 ) + ( x – 9 ) = x + 2 ; f) ( 27 – x ) + ( 15 + x ) = x – 24 .
Tính nhanh
( 121/122 x 123/125 + 127/129) x ( 1995/1996 x 17/16 - 21/25 : 16/17 ) x ( 42/30 x 75/23 - 19/23 x 210/38)
Bài gì mà lộn xộn vậy trời . Không hiểu gì luôn .
tính nhẩm :
a) 9 x 24 x 25
b) 12 x 125 x 54
c) 64 x 125 x 875
d) 425 x 7 x 4 - 170 x 60
e) 8 x 9 x 14 + 6 x 17 x 12 + 19 x 4 x 18
help mình , nhanh mình tick cho
a = 5400
b = 81000
c = 7 000 000
d = 108800
e = 3600 nhé bạn
k cho mình nha , cảm ơn nhiều
a,9 x 24 x 25= 5.400
b,12 x125 x54= 81.000
c,64 x 125 x 875 =7.000.000
d,425 x 7 x 4 - 170 x 60=1.700
e,8 x 9 x 14 + 6 x 17 x 12 +19 x 4 x18=3.600
Tính :
a) (37-17).(-5)+23.(-13-17)
b) (-57).(67-34)-67.(34-57)
tính nhanh :
a) (-4).(+125).(-25).(-6).(-8)
b) (-98).(1-246)-246.98
Tính nhanh :
C= 225 : 3^2 + 4^3 x 125 - 125 : 5^2
1/ tính
a) (37-17).(-5)+23.(-13-17)
b) (-57).(67-34)-67.(34-57)
2/ tính nhanh
a) (-4).(+125).(-25).(-6).(-8)
b) (-98).(1-246)-246.98