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a) 4,86 x 0,25 x 4 b) 0,125 x 6,94 x 40
= 4,86 x ( 0,25 x 4 ) = ( 0,125 x 40 ) x 6,94
= 4,86 x 10 = 5 x 6,94
= 48,6 = 34,7
c) 96,28 x 3,527 + 3,527 x 3,72 d) 72,9 x 99 + 72 + 0,9
= ( 96,28 + 3,72 ) x 3,72 = 72,9 x 99 + 72,9
= 100 x 3,72 = 72,9 x 99 + 72,9 x 1
= 372 =72,9 x ( 99 + 1 )
= 72,9 x 100
= 7290
e) 0,8 x 96 + 1,6 x 2
= 0,8 x 96 + 0,8 x 2 x 2
= 0,8 x 96 + 0,8 x 4
= 0,8 x ( 96 + 4 )
= 0,8 x 100
= 80
Tick cho mình nha !!!!
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
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+52,17-15,28-12,17
=(45,28-15,28)+(52,17-12,17)
=30+40
=70
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
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 ~
45,28 + 52,17 - 15,28 - 12,17
= ( 45,28-15,28 ) + ( 52,17 - 12,17 )
= 30 + 40 = 70
72,9 * 99 + 72 + 0,9
= 72,9 *99 + ( 72+0,9 )
= 72,9* 99 + 72,9
=72,9 * ( 99 + 1 )
= 72,9 * 100 = 7290
38,25-18,25+21,64-11,64+9,93
= 20 + 10 + 9,93
= 30 + 9,93 = 39,93
(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
(42,8*6,9-154,56):34,5
= 140,76 : 34,5 = 4,08
a: \(45,28+52,17-15,28-12,17\)
\(=\left(45,28-15,28\right)+\left(52,17-12,17\right)\)
=30+40
=70
b: \(\left(72,69+18,47\right)-\left(8,47+22,69\right)\)
\(=72.69+18,47-8,47-22,69\)
\(=\left(72,69-22,69\right)+\left(18,47-8,47\right)\)
=50+10
=60
c: \(96,28\cdot3,527+3,527\cdot3,72\)
\(=3,527\left(96,28+3,72\right)\)
\(=3,527\cdot100=352,7\)
d: \(4,86\cdot0,25\cdot40\)
\(=4,86\cdot10\)
=48,6
e: \(72,9\cdot99+72+0,9\)
\(=72,9\cdot99+72,9\)
\(=72,9\left(99+1\right)\)
\(=72,9\cdot100=7290\)
f: \(0,125\cdot6,94\cdot80\)
\(=\left(0,125\cdot80\right)\cdot6,94\)
\(=6,94\cdot10=69,4\)
g: \(0,8\cdot96+1,6\cdot2\)
\(=0,8\cdot96+0,8\cdot4\)
\(=0,8\left(96+4\right)\)
\(=0,8\cdot100=80\)