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15.{550: [450-(3.5^3-2^3.25)]}
= 15.{550: [ 450-(3.125-8.25)]}
= 15.{550:[ 450-( 375-200)]}
= 15.{550:[450- 175]}
=15.{550: 275}
= 15. 2
= 30
15 . { 550 : [ 450 - ( 3 . 53 - 23 . 25 )]}
= 15 . { 550 : [ 450 - ( 3 . 125 - 8 . 25 )]}
= 15 . { 550 : [ 450 - ( 375 - 200 )]}
= 15 . { 550 : [ 450 - 175 ]}
= 15 . { 550 : 275 }
= 15 . 2
= 30.
#Y/n
a.
\(180-\left(150.2+180.3-175.4\right)=180-\left(300+540-700\right)\)
\(=180-140=40\)
b. \(200:\left\{2.\left[32-\left(35-2^3\right)\right]+30\right\}=200:\left\{2.\left[32-\left(35-8\right)\right]+30\right\}\)
\(=200:\left\{2.5+30\right\}=200:40=5\)
b: =-45-27+8=-72+8=-64
c: =12:6=2
d: =-24:8=-3
e: =-36:9=-4
f: =14:7=2
(-12) + (-18)
= -30
------------------
(-90) + 27 + (-10) + 73
= [(-90) + (-10) + (27 + 73)
= -100 + 100
= 0
---------------------------------
25 . (-5) . (-4)
= 25 . (-4) . (-5)
= -100 . (-5)
= 100 . 5
= 500
----------------------------------------
(-15) . 40 : 6
= [(-15) . 40] : 6
= (-600) : 6
= -100
-----------------------------------
(-27) . 58 + (-27) . 42
= (-27) . (58 + 42)
= (-27) . 100
= -2700
72\(⋮\)x
=>x\(\in\)Ư(72)
<=>X\(\in\){-1;-2;-3;-4;-6;-8;-9;-12;-18;-24;-36;-72;1;2;3;4;6;8;9;12;18;24;36;72)
Vậy ......
132\(⋮\)x và 5<x<12
132\(⋮\)x =>x\(\in\)Ư(132)
<=>x\(\in\){...;-1;1;2;3;4;6;11;...}
Mà 5<x<12 nên x\(\in\){6;11}
Vậy x\(\in\){6;11}
a) \(x\in BC\left(3,5\right)\Rightarrow x\in\left\{0;15;30;45;60;...\right\}\)
mà \(x< 50\Rightarrow x\in\left\{0;15;30;45\right\}\)
b) \(\hept{\begin{cases}x⋮4\\x⋮6\end{cases}\Rightarrow}x\in BC\left(4;6\right)=\left\{0;12;24;36;48;...\right\}\)
mà \(x< 40\Rightarrow x\in\left\{0;12;24;36\right\}\)
c) \(\hept{\begin{cases}x⋮12\\x⋮15\end{cases}\Rightarrow}x\in BC\left(12;15\right)=\left\{0;60;120;180;...\right\}\)
mà \(x< 130\Rightarrow x\in\left\{0;60;120\right\}\)
TL:
a) x∈BC(3,5)⇒x∈{0;15;30;45;60;...}
mà x<50⇒x∈{0;15;30;45}
b) {
| x⋮4 |
| x⋮6 |
⇒x∈BC(4;6)={0;12;24;36;48;...}
mà x<40⇒x∈{0;12;24;36}
c) {
| x⋮12 |
| x⋮15 |
⇒x∈BC(12;15)={0;60;120;180;...}
mà x<130⇒x∈{0;60;120}
^HT^
Bài 1: Thực hiện các phép tính sau:
\(a)\)Chưa rỏ đề
\(b)\)\(5025\div5-25\div5\)
\(=\)\(1005-5\)
\(=\)\(1000\)
\(c)\)\(218-180\div2\div9\)
\(=\)\(218-10\)
\(=\)\(208\)
\(d)\)\(\left(328-8\right)\div32\)
\(=\)\(320\div32\)
\(=\)\(10\)
Bài 1:
a) ( Tôi không nhìn rõ đầu bài )
b) 5025 : 5 - 25 : 5
= ( 5025 - 25 ) : 5
= 5000 : 5
= 1000
c) 218 - 180 : 2 : 9
= 218 - 180 : ( 2 . 9 )
= 218 - 180 : 18
= 218 - 10
= 208
d) ( 328 - 8 ) : 32
= 320 : 32
= 10
a) $34-29+(-14)+129-(-114)$
$=34-29-14+129+114$
$=34+(129-29)+(114-14)$
$=34+100+100$
$=234$
b) $27\cdot(-35)+(-27)\cdot64-27$
$=(-27)\cdot35+(-27)\cdot64+(-27)\cdot1$
$=(-27)\cdot(35+64+1)$
$=(-27)\cdot(99+1)$
$=(-27)\cdot100$
$=-2700$
c) $160-(4\cdot5^2-3\cdot2^3)\cdot2-(-12)$
$=160-(4\cdot25-3\cdot8)\cdot2+12$
$=160-(100-24)\cdot2+12$
$=160-76\cdot2+12$
$=160-152+12$
$=160-(152-12)$
$=160-140$
$=20$
a, 34 - 29 + (-14) + 129 - (-114)
= 34 + (129 - 29) + (114 - 14)
= 34 + 100 + 100
= 234
b, 27.(-35) + (-27).64 - 27
= (-27).(35 + 64 + 1)
= - 27 . 100
= - 2700
c, 160 - (4.52 - 3.23).2 - (-12)
= 160 - (4.25 - 3.8).2 + 12
= 160 - (100 - 24).2 + 12
= 160 - 76.2 + 12
= 160 - 152 + 12
= 8 + 12
= 20
a) (-5) + (-10) + 20
= 20 - 5 - 10
= 5
b) 29 + (-40) + (-12)
= 29 - 40 - 12
= -23
c) 58 + (-14) + (-73)
= 58 - 14 - 73
= -29
\(a\text{)}\left(-5\right)+\left(-10\right)+20\)
\(=\left(-15\right)+20\)
\(=5\)
\(b\text{)}29+\left(-40\right)+\left(-12\right)\)
\(=\left(-11\right)+\left(-12\right)\)
\(=-23\)
\(c\text{)}58+\left(-14\right)+\left(-73\right)\)
\(=44+\left(-73\right)\)
\(=-29\)
\(\text{Hok tốt!}\)
\(\text{@Kaito Kid}\)