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a)5.(-8).2.(-3)
=[5.(-2)].[(-8).(-3)]
=-10.24
=-240
b)(45-135+72)-(45+72)
=45-135+72-45-72
=(45-45)+(72-72)-135
=0+0-135
=-135
c)3.(-5)2.2+2.(-5)-20
=3.25.2+2(-5)-20
=75.2+(-10)-20
=150+(-30)
=120
d)86.(-46)+46.27-46.41
=86.(-1).46+46.27-46.41
=-86.46+46.27-46.41
=46(-86+27-41)
=46(-100)
-4600
e)34(15-10)-15(34-10)
=34.15-34.10-15.34+15.10
=(34.15-15.34)+(15.10-34.10)
=[34(15-15)]+[10(15-34)]
=34.0+10(-9)
=0+(-90)
=-90
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a) \(3.5^2+15.2^2-26\div2\)
= 3.25 + 15.4 - 13
= 75 + 60 - 13
= 135 - 13
= 122
b) \(5^3.2-100\div4+2^3.5\)
= 125.2 - 25 + 8.5
= 250 - 25 + 40
= 225 + 40
= 265
c)\(6^2\div9+50.2-3^3.33\)
= 36 : 9 + 100 - 9.33
= 4 + 100 - 297
= 104 - 297
= -193
d)\(3^2.5+2^3.10-81\div3\)
= 9.5 + 8.10 - 27
= 45 + 80 - 27
= 125 - 27
= 98
e) \(5^{13}\div5^{10}-25.2^2\)
= 53 - 25.4
= 125 - 100
= 25
f) \(20\div2^2+5^9\div5^8\)
= 20 : 4 + 5
= 5 + 5
= 10
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a) 5 x (-8) x 2 x (-3)
= (5 x 2 ) x [(-8)x(-3)]
= 10 x 24
= 240
b) 3 x (-5)2 + 2 x ( -5 ) - 20
= 3 x 25 - 2 x 5 - 2 x 10
= 7.5 x 10 - 10 - 2 x 10
= ( 7.5 - 1 - 2 ) x 10
= 4.5 x 10
= 45
c) 34 x ( 15 - 10 ) - 15 ( 34 - 10 )
= [ 34 x 15 - 34 x 10 ] - [ 15 x 34 - 15 x 10 ]
= 34 x 15 - 34 x 10 - 15 x 34 + 15 x 10
= ( 34 x 15 - 15 x 34 ) - ( 34 x 10 - 15 x 10 )
= 0 - 10 ( 34 - 15 )
= 0 - 10 x 19
= -190
Tính nhanh
a) 5.(-8).2.(-3)
= (5 . 2) . [(-8) . (-3)]
= 10 . 24
= 240
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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 )
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1)
a) -(2+5) = -2 - 5 = -7
b) +(-3+6) = -3 + 6 = 3
c) (-50+3) = -50 + 3 = -47
d) -(-2+3) = 2 - 3 = -1
e) -(10-3) = -10 + 3 = -7
f) -(-3)-(-3+1) = 3 + 3 - 1 = 5
g) (-5)+(-2+10) = -5 - 2 + 10 = 3
2)
a) -50+120+(-150)-20+30
= -(50 + 20) + (120 + 30 - 150)
= -70
b) 265-70+(-65)-30+15
= (265 - 65) - (70 + 30) + 15
= 200 - 100 + 15 = 115
c) -17+185-183+(-85)-63
= (185 - 85) - (183 + 17) - 63
= 100 - 200 - 63 = -163
d) -30+60+(-170)-260+19
= -(170 + 30) - (260 - 60) + 19
= -200 - 200 + 19 = -381
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-1980 đúng k?
1980
HOk tot