Tinh nhanh
a)15,27-4,28-2,09
b)60-26,75-13,25
c)38,25-18,25+21,64-11,64+9,93
d)45,28+52,17-15,28-12,17
Tính bằng cách thuận tiện nhất a,15,27 4,18 2,09 b, 60 26,75 13,25 c, 38,25 18,25 21,64 11,64 9,93 d, 45 52,17 15,28 12,17 e, 72,69 18,47 8,47 22,69
Tính bằng cách thuận tiện:
60-26,75-13,25 38,25-18,25+21,64-11,64+9,93
45,28+52,17-15,28-12,17 (72,69+18,47)-(8,47+22,69)
a: \(60-26,75-13,25\)
\(=60-\left(26,75+13,25\right)\)
\(=60-40=20\)
b: \(38,25-18,25+21,64-11,64+9,93\)
\(=\left(38,25-18,25\right)+\left(21,64-11,64\right)+9,93\)
\(=20+10+9,93=39,93\)
c: \(45,28+52,17-15,28-12,17\)
\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)
=30+40
=70
d: \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=72,69+18,47-8,47-22,69\)
\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)
=50+10
=60
nhanh lên giúp mik.mik đang cần gấp
Tính bằng cách thuận tiện nhất : a,15,27 - 4,18 - 2,09 b, 60 - 26,75 - 13,25 c, 38,25 -18,25 + 21,64 - 11,64 + 9,93 d, 45 + 52,17 - 15,28 - 12,17 e, ( 72,69 + 18,47 ) - ( 8,47 + 22,69 làm hộ minh tí minh cần gấp
a)15,27-4,18-2,09
=15,27-(4,18+2,09)
=15,27-6,27
=9
b)60-26,75-13,25
=60-(26,75+13,25)
=60-40
=20
c)38,25-18,25+21,64-11,64+9,93
=(38,25-18,25)+(21,64-11,64)+9,93
=20+10+9,93
=39,93
d)45+52,17-15,28-12,17
=45+(52,17-12,17)-15,28
=45+40-15,28
=69,72
e)(72,69+18,47)-(8,47+22,69)
=72,69+18,47-8,48-22,69
=(72,69-22,69)+(18,47-8,47)
=50+10
=60
bạn hữu đức làm sai ý e
Tính bằng cách thuận tiện nhất :
a,15,27 - 4,18 - 2,09
b, 60 - 26,75 - 13,25
c, 38,25 -18,25 + 21,64 - 11,64 + 9,93
d, 45 + 52,17 - 15,28 - 12,17
e, ( 72,69 + 18,47 ) - ( 8,47 + 22,69 )
A, 15,27 - 4,18 - 2,09 = 15,27 - ( 4,18 + 2,09 )
= 15,27 - 6,27
= 9
B,
60-26,75-13,25=60-(26,75+13,25)=60-40=20
C,38,25-18,25+21,64-11,64+9,93=20+10+9,93=39,93
e,(72,69+18,47)-(8,47+22,69)=72,69+18,47-8,47-22,69=72,69-22,69+18,47-8,47=50+10=60
a, 15,27-4,18-2,09
=15,27-(4,18+2,09)
=15,27-6,27
=9
Tinh hop li neu co the
a:15,2-4,18-2,09 B; 60-26,75-13,35 C: 38,25-18,25+21,64-11,64
D:45,28+52,17-15,28-12,1
tính thuận tiện
60 - 26,75-13,25 38,25-18,25+21,64-11,64+9,93
45,28+52,17-15,28-12,17 (72,69+18,47)-(8,47+22,69)
(\_/) (._.) /><\ hihi
cái này cứ cái nào trong chục thì bạn cho vào trong ngoặc kép còn ko trong chục bạn cho ra ngoài
còn con cuối bạn cứ trừ như bình thường
~ HT ~
bài 2 : Tìm x
( 99,5 - x ) + 3,82 = 30
x + 37,66 = 80,94
76,22 - x = 38,08
36,7- x = 21,205
x + 17,67 = 100 - 63,2
Bài 3 : tính nhanh
15,27 - 4,13 - 1,14
60 - 26,75 - 13,25
38,25 - 18,75 + 21,64 - 11,64 + 9,23
( 72,69 + 18,47 ) - ( 8,47 + 22,69 )
60- 13, 75 - 26,25
15,27 - 4,18 - 2,09
45,28 + 52,17 - 15,28 - 12,17
( 8,27+ 7,16 + 9,33 ) - ( 7,27 + 6,16 + 8,33 )
Bài 2:a)\(\left(99,5-x\right)+3,82=30\)
\(99,5-x=30+3,82=33,82\)
\(x=99,5-33,82=65,68\)
b)\(x+37,66=80,94\)
\(x=80,94-37,66=43,28\)
c)\(76,22-x=38,08\)
\(x=76,22-38,08=38,14\)
d)\(36,7-x=21,205\)
\(x=36,7-21,205=15,495\)
e)\(x+17,67=100-63,2\)
\(x+17,67=36,8\)
\(x=36,8-17,67=19,13\)
Bài 3:
a)\(15,27-4,13-1,14\)
\(=\)\(15,27-1,14-4,13\)
\(=14,13-4,13=10\)
b)\(60-26,75-13,25\)
\(=\)\(60-\left(26,75+13,25\right)\)
\(=60-40=20\)
c)\(38,25-18,75+21,64-11,64+9,23\)
\(=\left(38,25-18,75\right)+\left(21,64-11,64\right)+9,23\)
\(=9,5+10+9,3\)
\(=19,5+9,3=28,8\)
Phần này mk ko chắc đâu nhé.
d)\(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=72,69+18,47-8,47-22,69\)
\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)
\(=50+10=60\)
e)\(60-13,75-26,25\)
\(=60-26,25-13,75\)
\(=33,75-13,75=20\)
g)\(15,27-4,18-2,09\)
\(=15,27-2,09-4,18\)
\(=13,18-4,18=9\)
h)\(45,28+52,17-15,28-12,17\)
\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)
\(=30+40=70\)
i)\(\left(8,27+7,16+9,33\right)-\left(7,27+6,16+8,33\right)\)
\(=8,27+7,16+9,33-7,27-6,16-8,33\)
\(=\left(8,27-7,27\right)+\left(7,16-6,16\right)+\left(9,33-8,33\right)\)
\(=1+1+1=3\)
Viết cái đống này mak hoa cả mắt. Mk đã tốn công vậy rùi nên bn nhất định phải k cho mk đó nha.(ko mk giận đó)
45,28+52,17-15,28-12,17
38,25+18,25+21,64-14,64+9,93
[72,69+18,47]-[8,47+26,69]
tính bằng cách thuận tiện
45,28+52,17-15,28-12,17
=(45,28-15,28)+(52,17-12,17)
=30+40
=70
45,28+52,17-15,28-12,17
=(45,28-15,28)+(52,17-12,17)
=30+40
=70
\(45,28+52,17-15,28-12,17\)
\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)
\(=30+40\)
\(=70\)
\(38,25+18,25+21,64-14,64+9,93\)
\(=\left(38,25+18,25\right)+\left(21,64-14,64\right)+9,93\)
\(=56,5+7+9,93\)
\(=73,43\)
\(\left(72,69+18,47\right)-\left(8,47+26,69\right)\)
\(=72,69+18,47-8,47-26,69\)
\(=\left(72,69-26,69\right)+\left(18,47-8,47\right)\)
\(=46+10\)
\(=56\)
1/tính bằng cách thuận tiện nhất
38,25-18,25 + 21,64 + 11,64 + 9,93
=
=
=
45,28 + 52,17 + 15,28 + 12,17
=
=
=
=(38,25-18,25)+(21,64+11,64)+9.93
=20+33.28+9.93
=53.28+9.93
=63,21
=(45,28+15,28)+(52,17+12,7)
=60.56+64,87
=125.43
dap an la 125.43
cac ban hay line cho minh nhe