Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a] 57 + 26 + 24 + 63
=( 57+63 )+ ( 26 + 24 )
=120 +50
=170
b) 24 + 25 + 26+27+28 + 29 + 30 + 31
=( 24+ 31) x ( 31-24 ) +1 : 2
=55 x 4
=220
c) 199 + 36 + 201 + 184 + 37
= ( 199 + 201 ) + ( 36 + 184 ) + 37
= 400 + 220 + 37
=657
d) 2 + 4 + 6 + 8 + 10 +.......+ 100
=( 100 + 2 ) x ( 100-2 ) : 2 + 1 : 2
= 102 x 25
=2550
Tk cho mk nha tk ai tk mk kb cho
a) = 57 + 63 + 26 + 24
= 120 + 50
= 170 ( có nhanh ko ta?! làm theo quán tính hoy)
b) = (31+24) \(\times\)8: 2
= 220
c) = 199 + 201+ 36+ 184 + 37
= 400+ 220 + 37
= 657
d) SSH= ( 100-2) : 2 + 1= 47
Tổng= (100+2) \(\times\)47: 2= 2397
check bạn nha!!! ^^
=16x2x(-39) + 16x(-22)
= 16 x (-78) + 16 x (-22)
= 16 x ( -78 + (-22)
= 16 x (-100)
= -1600
\(17\times2\times\left(-84\right)+17\times\left(-22\right)\)
\(17\times\left(-168\right)+17\times\left(-22\right)\)
\(17\times\left(-168+\left(-22\right)\right)\)
\(17\times\left(-190\right)\)
-3230
\(A=47.36+64.47+15\)
\(A=47.\left(36+64\right)+15\)
\(A=47.100+15\)
\(A=4700+15\)
\(A=4715\)
\(B=27+35+65+73+75\)
\(B=\left(27+73\right)+\left(35+65\right)+75\)
\(B=100+100+75\)
\(B=275\)
\(C=37+37.15+84.37\)
\(C=37.\left(1+15+84\right)\)
\(C=37.100\)
\(C=3700\)
\(D=\frac{1}{20.21}+\frac{1}{21.22}+\frac{1}{22.23}+\frac{1}{23.24}\)
\(D=\frac{1}{20}-\frac{1}{21}+\frac{1}{21}-\frac{1}{22}+\frac{1}{22}-\frac{1}{23}+\frac{1}{23}-\frac{1}{24}\)
\(D=\frac{1}{20}-\frac{1}{24}\)
\(D=\frac{24}{480}-\frac{20}{480}\)
\(D=\frac{4}{480}=\frac{1}{120}\)
\(E=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{49.50}\)
\(E=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{49}-\frac{1}{50}\)
\(E=1-\frac{1}{50}\)
\(E=\frac{49}{50}\)
( 1 + 2 + .... + 99 + 100 ) . ( 12 + 22 + .... + 102) . ( 65 . 111 - 13 . 15 . 37)
=( 1 + 2 + .... + 99 + 100 ) . ( 12 + 22 + .... + 102) . ( 13. 5 . 3. 37 - 13 . 15
37)
=( 1 + 2 + .... + 99 + 100 ) . ( 12 + 22 + .... + 102) . ( 13. 15 . 37 - 13 . 15
37)
=( 1 + 2 + .... + 99 + 100 ) . ( 12 + 22 + .... + 102) . 0
=0
\(\left(1+2+...+100\right)\cdot\left(1^2+2^2+...+10^2\right)\cdot\left(65\cdot111-13\cdot15\cdot37\right)\)
\(=\left[65\cdot111\left(1-1\right)\right]\cdot\left(1+2+...+100\right)\cdot\left(1^2+2^2+...+10^2\right)\)
=0
a) Đổi đơn vị : 100cm – 1m => 3 4 : 1 = 3 4
b) Đổi đơn vị : 22 phút = 22 60 = 11 30 h = > 4 11 : 11 30 = 120 121
-5 + ( -37 - 45 + 51 ) - ( -37 + 51 )
=-5+ -37 - 45 + 51- -37 + 51
=(37+(-37) +(51-(-51) + (45 - (-5)
=0+0+50
=50
-5 + ( -37 - 45 + 51 ) - ( -37 + 51 )
=-5 + (-45) + ( -37 + 51 ) - ( -37 + 51 )
=-50
-(15 - 47 + 58 ) + ( 15 - 47 ) + 3
=-(15 - 47) -58 + (15 - 47 ) + 3
=-58 + 3=-55
\(C=\left\{x\in\mathbb{N}|x⋮2,x⋮̸4,x\le22\right\}\)
\(D=\left\{x\in\mathbb{N}|64⋮x\right\}\)
A = 47 x 36 + 64 x 47 + 15
A= 47 x ( 64 + 36 ) + 15 = 47 x 100 + 15 = 4700 + 15 = 4715
vậy A= 4715
B= 27+35 + 65 + 73+ 75
B= (27+ 73) + ( 35 + 65) +75
B= 100 +100 +75 = 275
vậy B= 275
C= 37 +37 x 15 +37 x 84
C= 37 x ( 1+15 +84 )= 37 x 100 = 3700
vậy C= 3700
D = 1/20x21 + 1/21x22 + 1/22x23 + 1/23x24
D= 1/20 - 1/21 + 1/21 - 1/22 + 1/22 - 1/23 + 1/23 - 1/24
D= 1/20 -1/24 = 1/120 vậy D= 1/120
E= 1/1x2 + 1/2x3 + ...... + 1/49x50
E= 1/1 - 1/2 + 1/2 - 1/3 +...... + 1/49 - 1/50
E = 1 - 1/50 = 49/50
vậy E= 49/50
CHÚC HOK TOT