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a; 23.17 + 23.83 - 14
= 23.(17 + 83) - 14
= 8.100 - 14
= 800 - 14
= 786
b; -176 + 197 - (-76 + 97)
= -176 + 197 + 76 - 97
= -(176 - 76) + (197 - 97)
= - 100 + 100
= 0
c; 2022 - [45 - (6 - 1)2 ] + 20210
= 2022 - [45 - 52] + 1
= 2022 + 1 - [45 - 25]
= 2023 - 20
= 2003
a) (-124) + 24 = -100
b) 37. 78 + 37. 22
= 37 . ( 78 + 22 )
= 37 . 100
= 3700
(23.94+93.45):(92.10-92)
= ( 8. 94+93.9.5):(81.10-81)
= (8.94+94.5):(810-81)
=[94.(8+5)]:729
=[94.13]:729
=6561.13:729
=6561:729.13
=9.13
=117
Mk nhanh nhat day
(23.94+93.45):(92.10-92)
=(23.94+5.94):(81.10-81)
=[94.(8+5)]:(810-81)
=(6561.13):729
=85296:729
=117
e: =5/7(5/11+2/11-14/11)
=5/7(-7/11)=-5/11
f: =-5/4(2/11+9/11)+1+3/4
=-5/4+7/4
=2/4=1/2
g: =-5/7(3/13+10/13)+1+5/7
=-5/7+1+5/7
=1
h: =7/4(29/5-9/5)+41/13
=-7+41/13=-50/13
`8 2/7-(3 4/9+4 2/7)`
`=8+2/7-(3+4/9+4+2/7)`
`=8+2/7-7-2/7-4/9`
`=1-4/9`
`=5/9`
8 2/7-(3 4/9+4 2/7)
=58/7-31/9-30/7
=(58/7-30/7)-31/9
=4-31/9
=5/9
Số số hạng của dãy là : (397−1):4+1=100(397-1):4+1=100 ( số )
⇒⇒ Có 100:2=50100:2=50 ( cặp )
1−5+9−13+....+393−3971-5+9-13+....+393-397
=(1−5)+(9−13)+....+(393−397)=(1-5)+(9-13)+....+(393-397)
=(−4)+(−4)+....+(−4)=(-4)+(-4)+....+(-4)
=(−4).50=−200=(-4).50=-200
TK`1-5+9-13+...+393-397`
`=(1-5)+(9-13)+...+(393-397)` (197 cặp)
`=(-4)+(-4)+...+(-4)`
`=(-4) xx 197`
`=-788`
250-6 + 45-3 =>250-6 + 42 =>250-6 + 16 =>260
\(a)\)
\(\left(-31\right)+\left(50-19\right)-\left(150-31\right)\)
\(=\left(-31\right)+50-19-150+31\)
\(=\left(-150\right)-19\)
\(=-169\)
\(b)\)
\(25.\left(45-17\right)-45.\left(25-17\right)\)
\(=25.45-25.17-45.25+45.17\)
\(=0\)
\(c)\)
\(\frac{-1}{12}+\frac{4}{3}=\frac{5}{4}\)
\(d)\)
\(3+\frac{-5}{20}+\frac{30}{75}+\frac{-7}{4}\)
\(=\left(\frac{3}{5}+\frac{30}{75}\right)-\left(\frac{5}{20}+\frac{7}{4}\right)\)
\(=1-2\)
\(=-1\)
a) (-31)+(50-19)-(150-31)
= (-31)+50+(-19)-150+(-31)
= (-31)+50-150+(-19)-(-31)
= (-31)+(-100)+12
= -119
b) 25(45-17)-45(25-17)
= 25.45-25.17-45.25-45.17
= 25(45-45)-25(17-17)
= 0
c) -1/12 + 4/3
= -1/12 + 16/12
= 15/12
= 5/4
d) 3/5+(-5)/20+30/75+(-7)/4
= 45/75+30/75+(-5)/20+(-35)/20
= 1+(-2)
= -1
a, (-20) + 16 + (-34) + 20 = [(-20) + 20] + [16 + (-34)] = 0 + (-18) = (-18) b, 12 + 3.[39 - (5 - 2)2] = 12 + 3.[39 - 32] = 12 + 3.[39 - 9] = 12 + 3.30 = 12 + 90 = 102
\(\left(-2\right)^3-45\)
\(=-8-45\)
\(=-53\)
\(...............\)
\(\left(-3^2\right)+2022^0\cdot\left(-1\right)^{2023}\)
\(=9+1\cdot\left(-1\right)\)
\(=9+\left(-1\right)\)
\(=8\)