48 . 125 . 5
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a, ( - 5 ) . ( - 7 ) . 4 . 20 . ( - 25 )
= -70000
b, ( - 16 ) . 73 + ( - 16 ) . 27
= -1600
c, ( - 48 ) . 159 - ( - 48 ) . 59
= -4800
d , 72 . ( - 83 ) + ( - 72 ) . ( - 125 )
= 3014
e , ( - 81 ) . 125 - 181 . ( - 125 )
= 12500
#Hoctot
a -70000.0000
b-1600.000000
c-4800.000000
d-4968.000000
e-12500.00000
Trả lời :
\(48\cdot125\cdot5\)
\(=6\cdot8\cdot125\cdot5\)
\(=\left(6\cdot5\right)\cdot\left(125\cdot8\right)\)
\(=30\cdot1000\)
\(=30000\)
\(-\left(125+48+11\right)-\left(15-5-21\right)\)
\(=-125-48-11-15+5+21\)
\(=-140+5-48+10\)
\(=-130-43\)
=-173
a: =250:{5*(78-28)}
=250:{5*50}
=1
b: \(=3\cdot\left\{150:\left[152-77\right]\right\}\)
=3*{150:75}
=3*2=6
c: \(=12:\left\{390:\left[500-125-245\right]\right\}\)
=12:3=4
d: =100-[16*5+88]:28
=100-6=94
52x + 1 = 125
=> 52x + 1 = 53
=> 2x + 1 = 3
=> 2x = 3 - 1
=> 2x = 2
=> x = 2 : 2
=> x = 1
3 . 4x = 48
4x = 48 : 3
4x = 16
=> 4x = 42
=> x = 2
Nhớ tick cho mik nha !!!
5^2x+1=125
=>5^2x+1=5^3
2x+1=3
2x=3-1
2x=2
x=2:2
x=1
3.4^x=48
12^x=48
=>x=2
tick cho mk nha bạn
\(a,\\ 52^2+52.48=52.52+52.48=52.\left(52+48\right)=52.100=5200\\ b,\\ 39^2-39.29=39.39-39.29=39.\left(39-29\right)=39.10=390\\ c,\\ 99.5^3+125=99.125+125=125.\left(99+1\right)=125.100=12500\)
a) 52² + 52 . 48 = 2704 + 2496 = 5200
b) 39² - 39 . 29 = 1521 - 1131 = 390
c) 99 . 5³ + 125 = 99 . 125 + 125 = 12375 + 125 = 12400
\(2\sqrt{27}-\sqrt{\dfrac{16}{3}}-\sqrt{48}-\sqrt{8\dfrac{1}{3}}\)
\(=6\sqrt{3}-4\sqrt{\dfrac{1}{3}}-4\sqrt{3}-5\sqrt{\dfrac{1}{3}}\)
\(=2\sqrt{3}-9\sqrt{\dfrac{1}{3}}\)
\(=2\sqrt{3}-3\sqrt{9\cdot\dfrac{1}{3}}\)
\(=2\sqrt{3}-3\sqrt{3}\)
\(=-\sqrt{3}\)
________________________
\(\left(\sqrt{125}-\sqrt{12}-2\sqrt{5}\right)\left(3\sqrt{5}-\sqrt{3}+\sqrt{27}\right)\)
\(=\left(5\sqrt{5}-2\sqrt{3}-2\sqrt{5}\right)\left(3\sqrt{5}-\sqrt{3}+3\sqrt{3}\right)\)
\(=\left(3\sqrt{5}-2\sqrt{3}\right)\left(3\sqrt{5}+2\sqrt{3}\right)\)
\(=\left(3\sqrt{5}\right)^2-\left(2\sqrt{3}\right)^2\)
\(=15-12\)
\(=3\)
a) 298 x 47 - 298 x 27
= 298 x ( 47 - 27 )
= 298 x 20
= 5960
b) 954 + 954 x 147 - 954 x 47
= 954 x ( 147 - 47 )
= 954 x 100
= 95400
c) 120 : 5 + 380 : 5
= ( 120 + 380 ) : 5
= 400 : 5
= 80
d) ( 125 x 48 ) : 6
= 6000 : 6
= 1000
a) 298 x 47 - 298 x 27.
= 298 x (47 - 27).
= 298 x 20 = 5960.
b) 954 + 954 x 147 - 954 x 48.
= 954 x (1 + 147 - 48).
= 954 x (148 - 48).
= 954 x 100 = 95400.
c) 120: 5 + 380 : 5.
= (120 + 380) : 5.
= 500 : 5 = 100.
d) (125 x 48 ): 6
= (125 x 6 x 8) : 6.
= 125 x 8.
= 25 x 5 x 8.
= 25 x 40 = 1000.
48 . 125 . 5 = ( 48 . 5 ) . 125 = 240 . 125 = 30000