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a: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
( 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
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: \(60-26,75-13,25\)
\(=60-\left(26,75+13,25\right)\)
\(=60-40=20\)
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
432,71-287,36-112,64 60-26,75-13,25 (72,69+18,47)-(8,47+22,69)
=432,71-(287,36+112,64) =60-(26,75-13,25) =72,69+18,47-8,47-22,69
=432,71-400 =60-40 =72,69+10-22,69
=32,71 =20 =50+10
=60
45,25+52,17-15.28-12.17=(45.28-15.28)+(52.17-12.17)=30+50=80
(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
mình nha
45,28+52,17-15,28-12,17
=(45,28-15,28)+(52,17-12,17)
=30+40
=70
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
\(45,28+52,17-18,28-12,17\)
\(=\left(45,28-18,28\right)+\left(52,17-12,17\right)\)
\(=27+40\)
\(=67\)
\(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=91,16-31,16=60\)
1.45,28 +52,17-18,28-12,17=45,28-18,28+52,17-12,17=27+40=67
2.câu 2 dễ bạn phá ngoặc rồi làm nhé