B=1.32+3.52+....+97.992
b= 8,16 chia 1.32 +3.48 -0.346chia 2
10:1.32
8,16 : (1.32 + 3.48) - 0.345 : 2 =?
8.5 × ( 1.32 + 3.84) - 0.8
=
=
=
8,5 x (1,32 + 3,84) - 0,8
= 8,5 x 5,16 - 0,8
= 43,86 - 0,8
= 43,06
a) 3.52 + 15.22 – 26:2
b) 2021 + 5[300 – (17 – 7)2]
c) 32.5 + 23.10 – 81
a) 3.52 + 15.22 - 26 : 2
= 3.25 + 15.4 - 13
= 75 + 60 - 13
= 135 - 13
= 122
b) 2021 + 5.[300 - (17 - 7)2]
= 2021 + 5.[300 - 102]
= 2021 + 5.[300 - 100]
= 2021 + 5.200
= 2021 + 1000
= 3021
c) 32.5 + 23.10 - 81
= 9.5 + 8.10 - 81
= 45 + 80 - 81
= 125 - 81
= 44
a) 3.52 + 15.22 - 26 : 2
= 3. 25 + 15 . 4 - 26 : 2
= 75 + 60 - 13
= 135 - 13
= 122
b) 2021 + 5[300 - (17 - 7)2 ]
= 2021 + 5[300 - 102 ]
=2021 + 5[300 - 100]
=2021 + 5.200
=2021 + 1000
= 3021
c) 32 . 5 + 23 . 10 - 81
= 9 . 5 + 8 . 10 - 81
= 45 + 80 - 81
= 125 - 81
= 44
Thực hiện phép tính:
a) 2 2 . 3 2 - 5 . 2 . 3 ;
b) 5 2 . 2 + 20 : 2 2 ;
c) 7 2 . 15 - 5 . 7 2 ;
d) 3 . 5 2 + 15 . 2 2 - 1 2 . 3
Thực hiện phép tính:
a, 2 2 . 3 2 - 5 . 2 . 3
b, 5 2 . 2 + 20 : 2 2
c, 7 2 . 15 - 5 . 7 2
d, 3 . 5 2 + 15 . 2 2 - 1 2 . 3
Bài 3. Thực hiện phép tính:
a) ; 3.52-162 b) ;15.141+19.15
c) ; 23.17-23.14 d) .20-[30-(5-12)]
b: \(=15\left(141+19\right)=15\cdot160=24000\)
c: \(=2^3\cdot\left(17-14\right)=8\cdot3=24\)
Bài 1.32 trang 24 Toán 8 Tập 1: Thực hiên phép chia (7y5z2 – 14y4z3 + 2,1y3z4) : (−7y3z2).
`#3107`
\((7y^5z^2 – 14y^4z^3 + 2,1y^3z^4) \div (−7y^3z^2)\)
`= 7y^5z^2 \div (-7y^3z^2) - 14y^4z^3 \div (-7y^3z^2) + 2,1y^3z^4 \div (-7y^3z^2)`
`= -y^2 + 2yz - 0,3z^2`
a,3.52+(15.22-23.22)
b,75.34+76.75-75.10
c,84:4+3 mũ 9 : 3 mũ 7 +2017 mũ 0
a,3.52+(15.22-23.22)
= 156 + 22(15 - 23)
= 156 + 22. (-8)
= 156 - 176
= -20
b,75.34+76.75-75.10
= 75(34 + 76 - 10)
= 75. 100
= 7500
c,84:4+3 mũ 9 : 3 mũ 7 +2017 mũ 0
= 84 : 4 + 39 : 37 + 20170
= 21 + 9 + 1
= 31
a) Ta có: \(3\cdot52+\left(15\cdot22-23\cdot22\right)\)
\(=3\cdot52+22\cdot\left(15-23\right)\)
\(=3\cdot52+22\cdot\left(-8\right)\)
\(=156-176=-20\)
b) Ta có: \(75\cdot34+76\cdot75-75\cdot10\)
\(=75\cdot\left(34+76-10\right)\)
\(=75\cdot\left(110-10\right)\)
\(=75\cdot100\)
\(=7500\)
c) Ta có: \(84:4+3^9:3^7+2017^0\)
\(=21+3^{9-7}+1\)
\(=22+3^2\)
\(=22+9=31\)