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a)2^2 × 3 -[(2 × 3 - 5 ) ^ 10 +8]÷3^2
=2^2 × 3 - [(6-5) ^10+8]÷3^2
= 2^2 × 3-[1^10+8]÷3^2
=2^2×3 - [1+8]÷3^2
= 2^2 × 3 - 9 ÷ 3^2
=4×3-9÷9
= 12-1
=11
b)(-5)+[(-12)-5]+(15-13)
=-5 + -17 + 2
=-12 + 2
= -10
a) 22 . 3 - [ ( 2 . 3 - 5 )10 + 8 ] : 32
= 4 . 3 - [ ( 6 - 5 )10 + 8 ] : 9
= 12 - ( 110 + 8 ) : 9
= 12 - ( 1 + 8 ) : 9
= 12 - 9 : 9
= 12 - 1
= 11
b) ( -5 ) + [ ( -12 ) - 5 ] + ( 15 - 13 )
= ( -5 ) + ( -17 ) + 2
= -( 5 + 17 ) + 2
= ( -22 ) +2
= -( 22 - 2 )
= -20
a. 2.(72 – 2.32) – 60
= 2.(49 – 2.9) – 60
= 2.31 – 60
= 62 – 60 = 2
b. 27.63 + 27.37
= 27.(63 + 37)
= 27.100
= 2700
c. l-7l + (-8) + l-11l + 2
= 7 + (-8) + 11 + 2
= 12
d. 568 – 34 {5.l9 – ( 4-1)2l + 10}
= 568 – 34 {5.[9-9] + 10}
= 568 – 34.10
= 568 – 340
= 228
2 . ( 72 - 2 . 32) - 60
= 2 . ( 72 - 64 ) - 60
= 2. 8 - 60
= 16 - 60
= - 44
Giải:
a) \(\left(9\dfrac{4}{9}+5\dfrac{2}{3}\right)-5\dfrac{1}{2}\)
\(=\left(\dfrac{85}{9}+\dfrac{17}{3}\right)-\dfrac{11}{2}\)
\(=\dfrac{136}{9}-\dfrac{11}{2}\)
\(=\dfrac{173}{18}\)
b) \(\dfrac{13}{9}.\dfrac{15}{4}-\dfrac{13}{9}.\dfrac{7}{4}-\dfrac{13}{9}.\dfrac{5}{4}\)
\(=\dfrac{13}{9}.\left(\dfrac{15}{4}-\dfrac{7}{4}-\dfrac{5}{4}\right)\)
\(=\dfrac{13}{9}.\dfrac{3}{4}\)
\(=\dfrac{13}{12}\)
c) \(\dfrac{2}{3}+\dfrac{5}{8}-\dfrac{-1}{3}+0,375\)
\(=\left(\dfrac{2}{3}-\dfrac{-1}{3}\right)+\left(\dfrac{5}{8}+\dfrac{3}{8}\right)\)
\(=1+1\)
\(=2\)
d) \(75\%-3\dfrac{1}{2}+1,5:\dfrac{10}{7}\)
\(=\dfrac{3}{4}+\dfrac{7}{2}+\dfrac{3}{2}:\dfrac{10}{7}\)
\(=\dfrac{3}{4}+\dfrac{7}{2}+\dfrac{21}{20}\)
\(=\dfrac{53}{10}\)
e) \(1\dfrac{13}{15}.\left(0,5\right)^2.3+\left(\dfrac{8}{15}-1\dfrac{19}{60}\right):1\dfrac{23}{24}\)
\(=\dfrac{28}{15}.\dfrac{1}{4}.3+\left(\dfrac{8}{15}-\dfrac{79}{60}\right):\dfrac{47}{24}\)
\(=\dfrac{7}{5}+\dfrac{-47}{60}:\dfrac{47}{24}\)
\(=\dfrac{7}{5}+\dfrac{-2}{5}\)
\(=1\)
Cau a la ban hay tinh trong dau ngoac don truoc sau do lam nhoac vuong va lam dau ngoac nhon va tinh cac phep tinh con lai
a. 4.52.5.25.2
=(4.25).(5.2).52
=100.10.52
=1000.52
=52000
b. 2.32 + 4.32
=32 . (2+4)
=9.6
=54
a) \(64\left(10-2^3\right)=64.\left(10-8\right)=64.2=128\)
b)\(3^2.\left(56+44\right)=9.100=900\)
2.3-(8+2):5
=2.3-10:5
=6-2
=4
Nếu sai cho mik xin lỗi!
2.3-(8+2):5
=2.3-10:5
=6-2
=4