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a ) 25 - ( - 75 ) + 32 - ( 32 + 75
= 25 + 75 + 32 - 32 - 75
= 100 + 0 - 75
= 25
b ) 24 . ( 16 - 5 ) - 16 . ( 24 - 15 )
= 24 . 11 - 16 . 9
= 264 - 144
= 120
c ) 29 . ( 19 - 13 ) - 19 - ( 29 - 13 )
29 . 6 - 19 - 29 + 13
= 174 - 19 - 29 + 13
= 126 + 13
= 139
d ) ( 55 + 45 15 ) - ( 15 - 55 + 45 )
= 4570 - 15 + 10
= 4555 + 10
= 4565
a. 15 . 12 - 3 . 5 . 10
= 15 . 12 - 15 . 10
= 15 . (12 - 10)
= 15 . 2
= 30
b. 45 – 9.(13 + 5)
= 45 – (9 . 13 + 9 . 5)
= 45 – 9 . 13 - 9 . 5
= 45 – 117 - 45
= 45 - 45 - 117
= 0 - 117
= -117
c. 29. (19 – 13) – 19.(29 -13)
= 29 . 19 – 29 . 13 – (19 . 29 - 19 . 13)
= 29 . 19 – 29 . 13 – 19 . 29 + 19 . 13
= 29 . 19 - 19 . 29 - 29 . 13 + 19 . 13
= (29 . 19 - 19 . 29) - (29 . 13 - 19 . 13)
= 0 - 13 . (29 - 19)
= 0 - 13 . 10
= 0 - 130
= -130
d. 25 - (-75) + 32 – (32 + 75)
= 25 + 75 + 32 – 32 - 75
= (32 – 32) + (75 - 75) + 25
= 0 + 0 + 25
= 25
a: \(A=21\cdot100-11\cdot100+90\cdot100+100\cdot125\cdot16\)
\(=100\left(21-11+90\right)+100\cdot2000\)
\(=100\left(10+90+2000\right)=2100\cdot100=210000\)
b: \(=\dfrac{5\cdot2^{30}\cdot3^{18}-2^{29}\cdot3^{20}}{5\cdot2^{28}\cdot3^{19}-7\cdot2^{29}\cdot3^{18}}\)
\(=\dfrac{2^{29}\cdot3^{18}\left(5\cdot2-3^2\right)}{2^{28}\cdot3^{18}\left(5\cdot3-7\cdot2\right)}=2\)
31.(-18) + 31.(-81) - 31
= 31.(-18 - 81 - 1)
= 31.(-100) = -3100
-48 + 48.(-78) + 48.(-21) = 48.(-1 - 78 - 21) = 48. (-100) = -4800
-75.(8 - 65) - 65.(75 - 18) = -75.18 + 75.65 - 65.75 + 65.18 = 0
29.(19 - 13) - 19.(29 - 13) = 29.19 - 29.13 - 19.29 + 19.13 = 0
13.(23 + 22) - 3(17 + 28) = 13.25 - 3.45 = (10 + 3).25 - 3.45
= 10 . 25 + 3.25 - 3.45 = 10.25 - 3.(45 - 25)
= 250 - 3.20 = 250 - 60 = 190
(-25).21 . (-2)2.(|3|). (-1)2n + 2 (n \(\in\)N*)
= (-25. 4) . (21.3).1
= -100. 63 = -6300
a) Ta có: \(\left(-68+42\right)-\left(5042-6068\right)-\left(-2\right)^0\)
\(=-68+42-5042+6068-1\)
\(=6000-5000-1\)
\(=999\)
b) Ta có: \(29\cdot\left(19-37\right)-19\cdot\left(29-37\right)\)
\(=29\cdot19-29\cdot37-29\cdot19+19\cdot37\)
\(=-29\cdot37+19\cdot37\)
\(=37\cdot\left(-29+19\right)\)
\(=37\cdot\left(-10\right)=-370\)
c) Ta có: \(\left(-15\right)\cdot24+15\cdot\left(-75\right)-15\)
\(=\left(-15\right)\cdot24+\left(-15\right)\cdot75+\left(-15\right)\cdot1\)
\(=\left(-15\right)\cdot\left(24+75+1\right)\)
\(=-15\cdot100=-1500\)
d) Ta có: \(\frac{1}{5}+\frac{4}{7}-\frac{11}{35}\)
\(=\frac{5}{35}+\frac{20}{35}-\frac{11}{35}\)
\(=\frac{14}{35}=\frac{2}{5}\)
e) Ta có: \(\left(13\cdot95-73\right)-\left(13\cdot45+27\right)-\left(-1\right)^{2021}\)
\(=13\cdot95-73-13\cdot45-27-\left(-1\right)\)
\(=13\left(95-45\right)-\left(73+27\right)+1\)
\(=13\cdot50-100+1\)
\(=551\)
Bài 1: Tính hợp lý
a) ( - 68 + 42 ) - ( 5042 - 6068 ) - (-2)\(^0\)
= -26 - (-1026) - 1
= - 26 + 1026 - 1
= 1000 - 1
= 999
Mấy câu còn lại c hơi làm biếng, sr :<<
A) =(5+(-15))+(9+(-19))+(-11)+(13+17)+(21+(-23))
=(-10)+(-10)+(-11)+20+(-2)
=((-10)+(-10))+(-11)+(-2)+20
=(-20)+(-11)+20+(-2)
=((-20)+20)+((-11)+(-2))
=0+(-13)=-13
B) doi ti !!!!! Tich cho mik nha
29 . ( 19 - 13 ) - 19 . ( 29 - 13 )
= 29 . 6 - 19 . 6
= 174 - 114
= 60
Ủng hộ nhé ! Bấm Đúng nếu thấy mình trả lời đúng !
a)20-(-125).(-5).(-8) \(=20.\left(-5\right).1000=\left(-100\right).1000=-100000\)
b)2.11.(-8) \(=\left(-16\right).11=-176\)
c)123.25-75.(-12300) \(=123.\left(25+7500\right)=123.7525=925575\)
d)24.(16-5)-16.(24-5) \(=24.16-24.5-16.24+16.5=5.\left(-24+16\right)=5.\left(-8\right)=-40\)
e)29.(19-13)-19.(29-13) \(=29.19-29.13-19.29+19.13=13.\left(-29+19\right)=13.\left(-10\right)=-130\)
f)31.(-18)+31.(-81)-31 \(=31.\left(-18-81-1\right)=31.\left(-100\right)=-3100\)
a)29.(19-`13)-19.(29-13)
=29.6-19.16
=174-304
=-130
b) 27.75+25.75-150
=(27+25).75-150
=52.75-150
=3900-150
=3750
b,27.75+25.75-150=27.75+25.75-2.75=75.(27+25-2)=75.50=3750