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\(a,\left(13+150+47\right)-\left(13+47\right)\)
\(=13+150+47-13-47\)
\(=\left[13+\left(-13\right)\right]+\left[47+\left(-47\right)\right]+150\)
\(=0+0+150\)
\(=150\)
\(b,\left(-237\right)-\left[\left(-237+155\right)-55\right]\)
\(=\left(-237\right)+237+155-55\)
\(=0+100\)
\(=100\)
\(c,57.\left(62-43\right)-62.\left(57-43\right)\)
\(=57.62-57.43-62.57+62.43\)
\(=-57.43+62.43\)
\(=43.\left(-57+62\right)\)
\(=43.5\)
\(=215\)
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
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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
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Bài 2: Tính nhanh
a) 29 + 132 + 237 + 868 + 3
= 29+(132+858)+(237+3)
=29+990+240
=1259
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a)=(4.25).37
=100.37
=3700
b)=(132+868)+(763+237)+29
=1000+1000+29
=2029
c)=72+[131-1.20]
=49+[131-20]
=49+111
=160
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a ) 97 5 b ) 48 35 c ) − 37 3 . d ) − 19 39
e ) 17 2 f ) 34 49 g ) 568 9 . h ) 142 27
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49 . 55 + 46 . 49 - 49
=49(55+46)-49
=49.101-49
==> =49.100
=4900