25-(62+25)+(75-62)-(-25)
125:25+12.4 25-(62-75)+(-38) 2680+[10.(4³-54):5²+2⁴]
25 - ( 62 -75 ) + (- 38)
Thực hiện phép tính:
a/ 125 : 25 + 12 . 4
c/ 2680 + [ 10 . ( 43 - 54 ) : 52 + 24 ]
b/ 25 - ( 62 - 75 ) + ( - 38 )
Giúp em nha
a) 125 : 25 + 12 . 4 c) 2680 + [ 10 . ( 43 -54 ) : 52 + 24]
= 5 + 48 = 2680 + [ 10 . ( 64 - 54 ) : 25 + 16]
= 53 = 2680 + [ 10 . 10 : 25 + 16]
= 2680 + [ 100 : 25 + 16]
= 2680 + [ 4 + 16 ]
= 2680 + 20
= 2700
a/ 125 : 25 + 12 . 4
=5+48
=53
c/ 2680 + [ 10 . ( 43 - 54 ) : 52 + 24 ]
=2680 + [ 10 . 10 : 25 + 16 ]
= 2680 + 20
=2700
b/ 25 - ( 62 - 75 ) + ( - 38 )
= 25 - (- 13) + (- 38)
=25 + 13 + (- 38)
=38 + (-38)
=0
Tính hợp lí
125:25+12.4
25-(62-75)+38
334-(117+234)+(42+117)
\(125:25+12.4=5+48=53\)
\(25-\left(62-75\right)+38=25+13+38=76\)
Tính hợp lí
125:25+12.4
25-(62-75)+38
334-(117+234)+(42+117)
B=(3/1/3.1,9+19,5:4/1/3).(62/75-4/25)
(-2).(-6)2 +3.(-2)3 -62
(-6).4(-7).(-25)
(-85)+(-105)+62
24.(-15)+(-15).75-15
K = \(\left(3\dfrac{1}{3}.1,9+9,5:4\dfrac{1}{3}\right).\left(\dfrac{62}{75}-\dfrac{4}{25}\right)\)
\(K=\left(\dfrac{10}{3}\cdot\dfrac{19}{10}+\dfrac{19}{2}:\dfrac{13}{3}\right)\cdot\dfrac{2}{3}\)
\(=\dfrac{665}{117}\)
\(K=\left(\dfrac{10}{3}\cdot\dfrac{19}{10}+\dfrac{19}{2}:\dfrac{13}{3}\right)\cdot\left(\dfrac{62}{75}-\dfrac{12}{25}\right)=\left(\dfrac{19}{3}+\dfrac{57}{26}\right)\cdot\dfrac{2}{3}=\dfrac{665}{78}\cdot\dfrac{2}{3}=\dfrac{665}{117}\)
Tính bằng hai cách:
a, 2 5 : 2 4
b, 3 4 : 3 2
c, 6 3 : 6 2
d, 8 4 : 8 2
e, 7 5 : 7 4
f, 100 3 : 100
a, Cách 1: 2 5 : 2 4 = 32 : 16 = 2 1
Cách 2: 2 5 : 2 4 = 2 1
b, Cách 1: 3 4 : 3 2 = 81:9 = 9 = 3 2
Cách 2: 3 4 : 3 2 = 3 2
c, Cách 1: 6 3 : 6 2 = 216 : 36 = 6 = 6 1
Cách 2: 6 3 : 6 2 = 6 1
d, Cách 1: 8 4 : 8 2 = 4096 : 64 = 64 = 8 2
Cách 2: 8 4 : 8 2 = 8 2
e, Cách 1: 7 5 : 7 4 = 16807 : 2401 = 7 = 7 1
Cách 2: 7 5 : 7 4 = 7 1
f, Cách 1: 100 3 : 100 = 1000000 : 100 = 10000 = 100 2
Cách 2: 100 3 : 100 = 100 2