Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, 2075-(-37+2076+47)
= 2075 + 37 - 2076 - 47
= - (2076-2075) - (47-37)
= -1 - 10
= -11
b, 34 + 35 + 36 + 37 - 14 - 15 - 16 - 17
= (34-14) + (35-15) + (36-16) + (37-17)
= 20 + 20 + 20 + 20
= 20.4
= 80
c, (27-514)-(486-73)
= 27 - 514 - 486 + 73
= (27+73) - (514 + 486)
= 100 - 1000
= -900
A; 2015+37-2016-47
= (2016-2015)+(47-37)
= 1 + 1 =2
B;34+35+36+37-14-15-16-17
= (34-14)+(35-15)+(36-16)+(37-17)
= 20 + 20 + 20 + 20 = 80
C ;-7624 + (1543+7624) bổ ngoặc rồi tính
= -7624 +1543+7624
= (7624+-7624)+1543
= 0 +1543 = 1543
D; (27-514) -(486-73) quy tắc đổi dấu
= 27-514 -486-73
= -27 + -514 + -486 + -73
= (-27+-73)+(-486+-514)
= -100 + -1000 = -1100
=
a)
\(34.86+68.37\)
\(=34.2.43+68.37\)
\(=68\left(43+37\right)=68.70=4760\)
b)
\(47.25+137.49+47.75-37.49\)
\(=47\left(25+75\right)+49\left(137-37\right)\)
\(=47.100+49.100\)
\(=100\left(47+49\right)\)
\(=100.96\)
=9600
A = 5 11 + − 3 7 + 6 11 + 2 3 + − 4 7 = 5 11 + 6 11 + − 3 7 + − 4 7 + 2 3 = 2 3
13,28 . 37 + 6,72.53+13,28.63+6.72.47
= 13,28 . (37 +63) + 6,72. (47+ 53)
= 13,28 . 100 + 6,72. 100
= 100 . (13,28 + 6,72)
= 100 . 20
= 2000
\(A=47.36+64.47+15\)
\(A=47.\left(36+64\right)+15\)
\(A=47.100+15\)
\(A=4700+15\)
\(A=4715\)
\(B=27+35+65+73+75\)
\(B=\left(27+73\right)+\left(35+65\right)+75\)
\(B=100+100+75\)
\(B=275\)
\(C=37+37.15+84.37\)
\(C=37.\left(1+15+84\right)\)
\(C=37.100\)
\(C=3700\)
\(D=\frac{1}{20.21}+\frac{1}{21.22}+\frac{1}{22.23}+\frac{1}{23.24}\)
\(D=\frac{1}{20}-\frac{1}{21}+\frac{1}{21}-\frac{1}{22}+\frac{1}{22}-\frac{1}{23}+\frac{1}{23}-\frac{1}{24}\)
\(D=\frac{1}{20}-\frac{1}{24}\)
\(D=\frac{24}{480}-\frac{20}{480}\)
\(D=\frac{4}{480}=\frac{1}{120}\)
\(E=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{49.50}\)
\(E=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{49}-\frac{1}{50}\)
\(E=1-\frac{1}{50}\)
\(E=\frac{49}{50}\)
2075 + 37 - 2076 - 47
= 2075 - 2076 + 37 - 47
= -1 - 10
= -11
2075+37-2076-47=(2075-2076)+(37-47)=(-1)+(-10)=(-11)