12 + 23 = ?
28 + 83 = ?
tính bằng cách hợp lý
(217+172).(915-315).(24-42)
(71997-71995):(71994.7)
(12+23+34+45).(13+23+3343).(38-812)
(28+83):(25.23)
\(\left(2^{17}+7^2\right).\left(9^{15}-3^{15}\right).\left(2^4-4^2\right)\)
\(=\left(2^{17}+7^2\right).\left(9^{15}-3^{15}\right).\left(16-16\right)\)
\(=\left(2^{17}+7^2\right).\left(9^{15}-3^{15}\right).0\)
\(=0\)
-------------------------------------------------
\(\left(7^{1997}-7^{1995}\right):\left(7^{1994}.7\right)\)
\(=\left[7^{1995}\left(7^2-1\right)\right]:7^{1995}\)
\(=7^{1995}.48:7^{1995}\)
\(=48\)
-------------------------------------------------
\(\left(1^2+2^3+3^4+4^5\right).\left(1^3+2^3+3^3+4^3\right).\left(3^8-81^2\right)\)
\(=\left(1^2+2^3+3^4+4^5\right).\left(1^3+2^3+3^3+4^3\right).\left(6561-6561\right)\)
\(=\left(1^2+2^3+3^4+4^5\right).\left(1^3+2^3+3^3+4^3\right).0\)
\(=0\)
-------------------------------------------------
\(\left(2^8+8^3\right):\left(2^5.2^3\right)\)
\(=\left[2^8+\left(2^3\right)^3\right]:2^8\)
\(=\left(2^8+2^9\right):2^8\)
\(=2^8.\left(1+2\right):2^8\)
\(=2^8.3:2^8\)
\(=3\)
\((2^{17}+17^{2}).(9^{15}-3^{15}).(2^{4}-4^{2})\)
\(=(2^{17}+17^{2}).(9^{15}-3^{15}).(16-16)\)
\(=(2^{17}+17^{2}).(9^{15}-3^{15}).0\)
\(=0\)
\((7^{1997}-7^{1995}):(7^{1994}.7)\)
\(=(7^{1997}-7^{1995}):7^{1995}\)
\(=7^{1997}:7^{1995}-7^{1995}:7^{1995}\)
\(=7^{2}-1=49-1=48\)
\(1^{2}+2^{3}+3^{4}+4^{5}).(1^{3}+2^{3}+3^{3}+4^{3}).(3^{8}-81^{2})\)
\(=(1^{2}+2^{3}+3^{4}+4^{5}).(1^{3}+2^{3}+3^{3}+4^{3}).(6561-6561)\)
\(=(1^{2}+2^{3}+3^{4}+4^{5}).(1^{3}+2^{3}+3^{3}+4^{3}).0\)
\(=0\)
\((2^{8}+8^{3}):(2^{5}.2^{3})\)
\(=[2^{8}+(2^{3})^{3}]:2^{8}\)
\(=(2^{8}+2^{9}):2^{8}\)
\(=2^{8}:2^{8}+2^{9}:2^{8}\)
\(=1+2=3\)
a) 8. 4^5 - 3 .9 .12 +28 : 4. 2^0
b) 210+86 .2^3 : 2 -19 .23
c) 144 .12 +83 .11 - 17 .3
d) 54.23 +11^2 -152
a) 8 . 4^5 - 3 . 9 . 12 + 28 : 4 . 2^0 = 7875
b) 210 + 86 . 2^3 : 2 - 19 . 23 = 117
c) 144 .12 + 83 . 11 - 17 . 3 = 2590
d) 54 . 23 + 11^2 - 152 = 1211
a) 8 . 45 - 3 . 9 . 12 + 28 : 4 . 20 = 7875
b) 210 + 86 . 23 : 2 - 19 . 23 = 117
c) 144 . 12 + 83 . 11 - 17 . 3 = 2590
d) 54 . 23 + 112 - 152 = 1211
1/ (-86) + (-14)
2/ 123 + (-36)
3/(-44) - (-66)
4/ -82 + (-28)
5/ 83 + (-17)
6/ (-83) - 33
7/ 73 +(-24)
8/ 84 + (-48)
9/ (-72) - (+82)
10/ (-97) - (+82)
11/ 19+ ( -92 )
12/ 38 - (+28)
13/ (+13) + (-27)
14/ (-85) + 29
15/ (-84 ) - (-27)
16/ -23 + 78
17/ 93 + (-29)
18/ ( -74) - 83
19/ (-183) + 83
20/ 849 - (-3832)
1. -86 + ( -14)
= -86 - 14
= -100
2. 123 + ( -36)
= 123 - 36
= 87
3. ( -44) - ( -66)
= -44 + 66
= 22
4. -82 + (-28)
= -82 - 28
= -110
5. 83 + ( -17)
= 83 - 17
= 66
Các bài khác làm tương tự nha bạn
1/ (-86)+(-14)=-86-14=-100
2/123+(-36)=123-36=87
3/(-44)-(-66)=-44+66=22
4/-82+(-28)=-82-28=-110
5/83+(-17)=83-17=66
6/(-83)-33=(-83)+(-33)=-116
7/ 73+(-24)=73-24=49
8/84+(-48)=84-48=36
9/-72-82=-72+(-82)=-154
10/-97-82=-97+(-82)=-179
11/19+(-92)=19-92=-73
12/38-28=10
13/13+(-27)=13-27=-14
14/-85+29=-85-(-29)=-114
15/-84-(-27)=-84+27=-57
16/-23+78=-23-(-78)=-101
17/93+(-29)=93-29=64
18/-74-83=-74+(-83)=-157
19/-183+83=-183-(-83)=-266
20/849-(-3832)=849+3832=4681
Có gì sai mong bạn sửa giúp mình nhé!
ối dồi ôi nhiều thế
mk chịu
1/ (-86) + (-14)
2/ 123 + (-36)
3/(-44) - (-66)
4/ -82 + (-28)
5/ 83 + (-17)
6/ (-83) - 33
7/ 73 +(-24)
8/ 84 + (-48)
9/ (-72) - (+82)
10/ (-97) - (+82)
11/ 19+ ( -92 )
12/ 38 - (+28)
13/ (+13) + (-27)
14/ (-85) + 29
15/ (-84 ) - (-27)
16/ -23 + 78
17/ 93 + (-29)
18/ ( -74) - 83
19/ (-183) + 83
20/ 849 - (-3832)
Câu 1 : Thực hiện các phép tonhs sau một cách hợp lí :
a, 21 .41 + 21 . 59 + 79 . 23 + 79 . 77
b, 28 . 76 + 24 . 28 - 28 . 20
c, 56 . 73 + 73 . 44 - 730
\(d,80-\left(4.5^2-3.2^3\right)\)
\(e,\left(-12\right)+83+\left(-48\right)-\left(-17\right)\)
g, 12 + ( -2 - 2 ) - ( 28 - 24 + 12 )
Bài toán 4: Thực hiện các phép tính sau bằng cách hợp lý.
a) (217+ 172).(915– 315).(24 – 42)
b) (82017– 82015) : (82104.8)
c) (13+ 23+ 34 + 45).(13 + 23 + 33 + 43).(38 – 812)
d) (28+ 83) : (25.23)
a: Ta có: \(\left(2^{17}+17^2\right)\cdot\left(9^{15}-3^{15}\right)\cdot\left(2^4-4^2\right)\)
\(=\left(2^{17}+17^2\right)\cdot\left(9^{15}-3^{15}\right)\cdot\left(16-16\right)\)
=0
b: Ta có: \(\dfrac{8^{2017}-8^{2015}}{8^{2104}\cdot8}\)
\(=\dfrac{8^{2015}\cdot\left(8^2-1\right)}{8^{2105}}\)
\(=\dfrac{1\cdot63}{8^{90}}\)+
c: Ta có: \(\left(1^3+2^3+3^4+4^5\right)\cdot\left(1^3+2^3+3^3+4^3\right)\cdot\left(3^8-81^2\right)\)
\(=\left(1^3+2^3+3^4+4^5\right)\cdot\left(1^3+2^3+3^3+4^3\right)\cdot\left(3^8-3^8\right)\)
=0
d: Ta có: \(\left(2^8+8^3\right):\left(2^5\cdot2^3\right)\)
\(=\dfrac{2^8+2^9}{2^8}\)
=3
Điền dấu >, <, = vào chỗ chấm
38 … 83
45 + 23 … 45 – 24
12 + 37 … 37 + 12
56 – 0 … 56 + 0
Lời giải chi tiết:
38 < 83
45 + 23 > 45 – 24
12 + 37 = 37 + 12
56 – 0 = 56 + 0
38 < 83
45 + 23 > 45 -24
12 +37 = 37+12
56-0=56+0
so sánh bằng cách nhanh nhất
-12/37 và 28/-83
tinh gia tri bieu thuc
a,{-12} + 83 +{-48} + 17
b,75 -{3*5^2-4*2^3}
c,12+{-24}-2+24
d,28*76+24*28-28*20
........................giup minh nha...................