a) 519 : 517 + 3) : 7
b) 511 + (-520) + |-89| + (-80)
a) (519 : 517 + 3) : 7
b) 79 : 77 – 32 + 23.52
c) 1200 : 2 + 62.21 + 18
a: \(=\left(5^2+3\right):7=4\)
b: \(=7^2-3^2+8\cdot25=40+200=240\)
a) (519 : 517 + 3) : 7
= (52 + 3) : 7
= (25 + 3) : 7
= 28 : 7
= 4
b) 79 : 77 - 32 + 23 . 52
= 72 - 9 + 8 . 25
= 49 - 9 + 200
= 40 + 200
= 240
c) 1200 : 2 + 62 . 21 + 18
= 600 + 36 . 2 + 18
= 600 + 72 + 18
= 672 + 18
- 690
Giúp mình với nhưng làm hết đc ko ạ
a) (519 : 517 + 3) : 7 b) 79 : 77 – 32 + 23.52 c) 1200 : 2 + 62.21 + 18 d) 59 : 57 + 70 : 14 – 20 e) 32.5 – 22.7 + 83 f) 59 : 57 + 12.3 + 70 g) 151 – 291 : 288 + 12.3 h) 238 : 236 + 51.32 - 72 i) 791 : 789 + 5.52 – 124 j) 4.15 + 28:7 – 620:618 k) (32 + 23.5) : 7 l) 1125 : 1123 – 35 : (110 + 23) – 60 m) 520 : (515.6 + 515.19) |
a, = (5^2 +3) : 7
= (25 +3) :7
= 28 : 7
= 4
a: \(=\left(5^2+3\right):7=28:7=4\)
b: \(=7^2-3^2+8\cdot25\)
=49-9+200
=240
d) 59 : 57 + 70 : 14 – 20
= 59-7 + 70 : 14 -20
= 52 + 70 : 14 - 20
= 25 + 70 : 14 - 20
= 25 + 5 - 20
= 30 - 20
= 10
e) 32.5 – 22.7 + 83
= 9.5 - 4.7 + 83
= 45 - 28 + 83
= 156
Giúp mình trả lời hết đi ạ vì hơi đứt đoạn nên ko hiểu mấy!
a) (519 : 517 + 3) : 7 b) 79 : 77 – 32 + 23.52 c) 1200 : 2 + 62.21 + 18 d) 59 : 57 + 70 : 14 – 20 e) 32.5 – 22.7 + 83 f) 59 : 57 + 12.3 + 70 g) 151 – 291 : 288 + 12.3 h) 238 : 236 + 51.32 - 72 i) 791 : 789 + 5.52 – 124 j) 4.15 + 28:7 – 620:618 k) (32 + 23.5) : 7 l) 1125 : 1123 – 35 : (110 + 23) – 60 m) 520 : (515.6 + 515.19) |
a: \(=\left(5^2+3\right):7=4\)
b: \(=49-9+8\cdot25=240\)
bước 1 bạn phân tích lủy thữa ra số tự nhiên
bước 2 tính theo giá trị của biểu thức
ví dụ câu E
3^2=9
2^2=4
9.5-4.7+83
=45-28+83
=17+83=100
(.là nhân)
Bài2:Thựchiệnphéptính:
a. (519 : 517 + 3) : 7 b. 79 : 77 – 32 + 23.52 c. 1200 : 2 + 62.21 + 18 d. 59 : 57 + 70 : 14 – 20
| e. 32.5 – 22.7 + 83 f. 59 : 57 + 12.3 + 70 g. 5.22 + 98:72 h. 311 : 39 – 147 : 72 | i. 295 – (31 – 22.5)2 j. 151 – 291 : 288 + 12.3 k. 238 : 236 + 51.32 - 72 l. 791 : 789 + 5.52 – 124 m. 4.15 + 28:7 – 620:618 |
a: \(\left(5^{19}:5^{17}+3\right):7=\left(5^2+3\right):7=4\)
b: \(7^9:7^7-3^2+2^3\cdot5^2\)
\(=7^2-3^2+8\cdot25\)
=49-9+200
=240
c: \(1200:2+6^2\cdot2^1+18\)
\(=600+72+18\)
=690
(519:517+3):7
\(\left(5^{19}:5^{17}+3\right):7\)
\(=\left(5^2+3\right):7\)
\(=\left(25+3\right):7\)
\(=28:7\)
\(=4\)
giúp em bài này luôn ạ
*c) (519 : 517 + 3) : 7
c) (519 - 17 + 3) : 7
= (52 + 3) : 7
= (25 + 3) : 7
= 28 : 7
= 4
( 519 : 517 - 4 ) : 7
=( 52 - 4 ) : 7
=( 25 - 4 ) : 7
= 21 : 7
=3
thực hiện các phép tính:
48:4+39:37+50
=
(519:517+3):7
=
295-(31-22.5)2
=
62:9+50.2-33.3
=
\(48\div4+3^9\div3^7+5^0\)
\(=12+9+1\)
\(=22\)
\(\left(5^{19}\div5^{17}+3\right)\div7\)
\(=\left(25+3\right)\div7\)
\(=28\div7\)
\(=4\)
\(295-\left(32-2^2\times5\right)^2\)
\(=295-144\)
\(=151\)
\(6^2\div9+50\times2-3^3\times3\)
\(=36\div9+100-27\)
\(=4+100-27\)
\(=100-27\)
\(=73\)
\(48:4+3^9:3^7+5^0\)
\(=12+3^{9-7}+1\)
\(=12+9+1\)
\(=22\)
\(\left(5^{19}:5^{17}+3\right):7\)
\(=\left(5^{19-17}+3\right):7\)
\(=\left(5^2+3\right):7\)
\(=\left(25+3\right):7\)
\(=28:7\)
\(=4\)
\(295-\left(31-2^2\cdot5\right)^2\)
\(=295-\left(31-4\cdot5\right)^2\)
\(=295-\left(31-20\right)^2\)
\(=295-11^2\)
\(=295-121\)
\(=174\)
\(6^2:9+50\cdot2-3^3\cdot3\)
\(=36:9+50\cdot2-3^4\)
\(=4+100-81\)
\(=23\)
\(48:4+3^9:3^7+5^0=12+3^2+1=12+9+1=22\)
\(\left(5^{19}:5^{17}+3\right):7=\left(5^2+3\right):7=\left(25+3\right):7=28:7=4\)
\(295-\left(31-2^2.5^2\right)=295-\left(31-10^2\right)=295-\left(31-100\right)=295-\left(-69\right)=364\)
\(6^2:9+50.2-3^3.3=36:9+100-3^2=4+100-9=95\)
Thực hiện phép tính (Tính nhanh nếu có thể)
a) 20 : 2 2 − 5 9 : 5 8
b) ( 5 19 : 5 17 − 4 ) : 7 0
c) 295 − ( 31 − 2 2 .5 ) 2
a) 20 : 2 2 − 5 9 : 5 8 = 5 − 5 = 0
b) ( 5 19 : 5 17 − 4 ) : 7 0 = ( 5 2 − 4 ) : 1 = 21
c) 295 − ( 31 − 2 2 .5 ) 2 = 295 − 11 2 = 174
a 20:2^2 -5^9:5^8
= 20:4 - 5^1
=5-5
=0
a) 20 : 2 2 − 5 9 : 5 8 = 5 − 5 = 0.
b) ( 5 19 : 5 17 − 4 ) : 7 0 = ( 5 2 − 4 ) : 1 = 21.
c) 295 − ( 31 − 2 2 .5 ) 2 = 295 − 11 2 = 174.
;)