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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
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: \(60-26,75-13,25\)
\(=60-\left(26,75+13,25\right)\)
\(=60-40=20\)
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
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 ~
a) \(15,27-4,18-2,09\)
\(=11,09-2,09\)
\(=9\)
b) \(60-26,75-13,25\)
\(=60-\left(26,75+13,25\right)\)
\(=60-40\)
\(=20\)
c) \(38,25-18,25+21,64-11,64+9,93\)
\(=\left(38,25-18,25\right)+\left(21,64-11,64\right)+9,93\)
\(=20+10+9,93\)
\(=30+9,93\)
\(=39,93\)
e) \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=72,69+18,47-8,47-22,69\)
\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)
\(=50+10\)
\(=60\)
Chiều dài của hình chữ nhật là:
\(36\div\dfrac{3}{5}=60\left(cm\right)\)
Sợi dây thép đso dài số mét là:
\(\left(60+36\right)\times2=192\left(cm\right)\)
Đổi: \(192cm=1,92m\)
Đáp số: \(1,92m\)
45,28+52,17-15,28-12,17
=(45,28-15,28)+(52,17-12,17)
=30+40
=70
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)
Tính bằng cách thuận tiện:
a) 15,27 - 4,18 - 2,09 = (15,27 - 4,18) - 2,09
= 13,09 - 2,09
= 11
b) 60 - 26,75 - 13,25 = 60 - (26,75 + 13,25)
= 60 - 40
= 20
c) [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
Chúc học tốt!
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
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
d: 45,28+52,17-15,28-12,17
=45,28-15,28+52,17-12,17
=30+40
=70
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