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A) (-7) + 10 = 3
B)-17 + 5 + 8 +17=(-17+17)+5+8=0+13=13
C)30+12+20+-12=(12+-12)+30+20=0+50=50
D)-54*6+-46*6=6*(-54-46)=6*-100=-600
Nhiều quá ~_~! Thôi k cho mình nhá @@
a)-7+10=3;b)(-17)+5+8+17=13;c)30+12+-20+-12=10
d)(-54).6+(-46).6=-600;e)56.(-7)+44.(-7)=-700;f)5-(7-9)=7
g)(-7)2.23=392;h)140-7(5+20)=-35;i)(13+150+47)-(13+47)=150
k)(-237)-[(-237+155)-55]=-100;l)57.(62-43)-62.(57-43)=215
k mình nha
a,x+(-45)=(-62)+17
<=>x=(-62)+17+45
<=>x=0
b,x+29=\(|-43|\)-+(-43)
<=>x=43-43-29
<=>x=-29
c,43+(9-21)=317-(x+317)
<=>31=317-x-317
<=>31=-x
<=>-31=x
d, (15-x)+(x-12)=7-(-5-x)
<=>15-x+x-12=7+5+x
<=>3=12+x
<=>-9=x
e, x-{57-[42+(-23-x)]}=13-{47+[25-(32-x)]}
<=>x-57+42-23-x=13-47-25+32-x
<=>76=-27-x
<=>103=-x
<=>-103=x
f,\(|x|+|-4|=7\)
<=>\(|x|\)+4=7
<=>\(|x|\)=3
<=>x=3 hoặc x=-3
\(27.332+93.43+57.61+69.57\\ =27.332+93.43+57.\left(61+69\right)\\ =27.332+93.43+57.130\\ =8964+3999+7410=20373\\ 34.75+75.66-65.100\\ =\left(34+66\right).75-65.100\\ =100.75-65.100\\ =100.\left(75-65\right)\\ =100.10=1000\\ \left(456.11+912\right).37:13:74\\ =5928:13:\left(74:37\right)\\ =456:2=228\\ 6^2:4.3+2.5^2\\ =36:4.3+2.25\\ =9.3+50=27+50=77\\ 5.4^2-18:3^2\\ =5.16-18:9\\ =80-2=78\\\left[\left(315+372\right).3+\left(372+315\right).7\right]:\left(26.13+74.14\right)\\ =687.\left(3+7\right):\left(338+1036\right)\\ 687.10:1374\\ =6870:1374=5\\ 12:\left\{390:\left[500-\left(125+35.7\right)\right]\right\}\\ =12:\left[390:\left(500-370\right)\right]\\ =12:\left(390:130\right)=12:3=4\\ 192000-\left(1500.2+1800.3+1800.2:3\right)\\ =192000-\left(3000+5400+1200\right)\\ =192000-9600=182400\)
a. ( - 57 ) . ( 67 - 34 ) - 67 . (34 -57 )
= - 57 . 67 - ( - 57 ) . 34 - 67 . 34 - 67 . 57
= 57 . ( 67 - 67 ) + 34 . ( 67 - 57 )
= 57 . 0 + 34 . 10
= 0 + 340
= 340
ko ghi lại đề
\(\Rightarrow x-57-42-23-x=13-47+25-32+x\)
\(\Rightarrow x-x+x=13-47+25-32+57+42+23\)
\(\Rightarrow x=\left(13+23\right)-\left(47+57\right)+\left(25+57\right)-\left(32+42\right)\)
\(\Rightarrow x=36-104+82-74\)
\(\Rightarrow x=-60\)
bn j ơi, bn chép sai đề gồi
phải là 43 chớ ko phải 42 ngheng bn
a, -87 + ( - 750 ) + 2018 - 13 + 750
= [ -87 + ( - 13 ) ] + [ - 750 + 750 ] + 2018
= ( - 100 ) + 0 + 2018 = 1918
b) ( 45 + 12 - 13 ) - ( 45 - 13 + 12 )
= 45 + 12 - 13 - 45 + 13 - 12
= 0
c) -15 x 56 + 43 x (-15)
= (-15) x ( 56 + 43 )
= ( - 15 ) x 99
= - 1485
e) 24 . ( 16 - 5 ) - 16 . ( 24 - 5 )
= 24 . 16 - 24 . 5 - 16 . 24 - 16 . 5
= - 40
hai cau kia mk chiu
c) \(-15.56+43.\left(-15\right)\)
\(=-15.\left(-15\right)+\left(56+43\right)\)
\(=0+43+56\)
\(=0+99\)
\(=99\)
( mk chỉ bít làm mỗi câu c thôi thông cảm mk nhé )
\(a,\left(13+150+47\right)-\left(13+47\right)\)
\(=13+150+47-13-47\)
\(=\left[13+\left(-13\right)\right]+\left[47+\left(-47\right)\right]+150\)
\(=0+0+150\)
\(=150\)
\(b,\left(-237\right)-\left[\left(-237+155\right)-55\right]\)
\(=\left(-237\right)+237+155-55\)
\(=0+100\)
\(=100\)
\(c,57.\left(62-43\right)-62.\left(57-43\right)\)
\(=57.62-57.43-62.57+62.43\)
\(=-57.43+62.43\)
\(=43.\left(-57+62\right)\)
\(=43.5\)
\(=215\)
a , ( 13 + 150 + 47 ) - ( 13 + 47 )
= 12 + 150 + 47 - 13 - 47
= [ 12 + ( - 13 ) ] + [ 47 + ( - 47 ) ] + 150
= - 1 + 0 + 150
= 149
b , ( - 237 ) - [ ( - 237 + 155 ) - 55 ]
= - 237 - [ - 237 + 155 - 55 ]
= - 237 + 237 - 155 + 55
= [ ( - 237 ) + 237 ] + [ ( - 155 ) + 55 ]
= 0 + ( - 100 )
= - 100
c , 57 . ( 62 - 43 ) - 62 . ( 57 - 43 )
= 57 . 62 - 57 . 43 - 62 . 57 - 62 . 43
= [ 57 . 62 - 62 . 57 ] . [ 62 . 43 - 62 . 43 ]
= 0 . 0
= 0