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a, \(\left(-23\right).43+\left(-23\right).65-\left(-23\right).8\\ =\left(-23\right).\left(43+65-8\right)\\ =\left(-23\right).100=-2300\)
b,\(\left(-43\right).25+25.\left(-19\right)+25.\left(-38\right)\\ =25.\left[\left(-43\right)+\left(-19\right)+\left(-38\right)\right]\\ =25.\left(-100\right)=-2500\)
c,\(\left(-26\right).13+86.\left(-26\right)+\left(-26\right)\\ =\left(-26\right).\left(13+86+1\right)\\ =\left(-26\right).100=-2600\)
d,\(\left(-17\right).39+\left(-17\right)+\left(-17\right).60\\ =\left(-17\right).\left(39+1+60\right)\\ =\left(-17\right).100=-1700\)
a) (-32) . 43 + (-32) . 65 - (-32) . 8
= (-32) . (43 + 65 - 8)
= (-32) . 100
= -3200
b) (-43) . 25 + 25 . (-19) + 25 . (-38)
= 25 . [(-43) + (-19) + (-38)]
= 25 . (-100)
= -2500
c) (-26) . 13 + 86 . (-26) + (-26)
= (-26) . (13 + 86 + 1)
= (-26) . 100
= -2600
d) (-17) . 39 + (-17) + (-17) . 60
= (-17) . (1 + 39 + 60)
= (-17) . 100
= -1700
a)271+43-271-17=26
b)38-29+43-43-38=-29
c)-20-25+11+8+25-8+20=11
học tốt
a) 5 + (-5) = 0
b) 71-52 = 19
c) 28 + (-82) = -64
d) 47 + (-30) = 17
e) (-41) + (-59) = -100
f) 75 + (-10) = 65
t) 26 - 43 = -17
y) 90 - 25 = 650
o) 72 + (-9) = 63
p) (-3) + 3 = 0
a)126.(-43)+26.43=43(-126+26)=43(-100)=-4300
b)(-135)(-45)-35.45=-45(-135+35)=-45(-100)=4500
c)113(-27)+27.13=27(-113+13)=27(-100)=-2700
d)125(-35)-(-25).35=-35(125-25)=-35.100=-3500
\(a)126.\left(-43\right)+26.43\)
\(=\left(-126\right).43+26.43\)
\(=43\left(-126+26\right)\)
\(=43.\left(-100\right)\)
\(=-4300\)
\(b)\left(-135\right).\left(-45\right)-35.45\)
\(=135.45-35.45\)
\(=45\left(135-35\right)\)
\(=45.100\)
\(=4500\)
\(c)113.\left(-27\right)+27.13\)
\(=\left(-113\right).27+27.13\)
\(=27\left(-113+13\right)\)
\(=27.\left(-100\right)\)
\(=-2700\)
\(d)125.\left(-35\right)-\left(-25\right).35\)
\(=\left(-125\right).35-\left(-25\right).35\)
\(=35\left(-125+25\right)\)
\(=35.\left(-100\right)\)
\(=-3500\)
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
x - {34 - [26 + ( -66 - x)]} = 27 - { 43 + [ 25 - (20 - x )]}
⇔x - {34 - [26 - 66 -x ]} = 27 - { 43 + [25 - 20 - x]}
⇔x - {34 - 26 + 66 + x} = 27 - {43 + 25 - 20 - x}
⇔x - {74 + x} = 27 - {47 - x}
⇔x - 74 + x = 27 - 47 + x
⇔(x-x) -74 = x -20
⇔-74 =x -20
⇒ x = -74 +20 =-54
\(x-\left\{34-\left[-40-x\right]\right\}=27-\left\{43+5+x\right\}\\ \Leftrightarrow x-\left\{74+x\right\}=-21-x\\ \Leftrightarrow-21-x=-74\\ \Leftrightarrow-x=-53\\ \Leftrightarrow x=53\)
a)43 + 25 + (−43) + (−26)
=(43-43)+(25-26)
=-1
b)(−20). 9. (−50). 7
=[(-20).(-50)].9.7
=100.63
=6300
c)85.39 + 85.61 − 300
=85.(39+61)-300
=85.100-300
=8500-300
=8200