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15 + 25 + 35 + 45 + 55 + 65 + 75 + 85
= (15 + 85) + (25 + 75) + (35 + 65) + (45 + 55)
= 100 + 100 + 100 + 100
= 400
15+25+35+45+55+65+75+85
=(15+85)+(25+75)+(35+65)+(45+55)
=100+100+100+100
=400
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a: \(542\cdot7+542\cdot2+542\)
\(=542\left(7+2+1\right)\)
\(=542\cdot10=5420\)
b: \(\left(126\cdot35+157\cdot55\right)\cdot\left(132-6\cdot22\right)\)
\(=\left(126\cdot35+157\cdot55\right)\left(132-132\right)\)
\(=0\cdot\left(126\cdot35+157\cdot55\right)\)
=0
c: \(897\cdot99+897\)
\(=897\left(99+1\right)\)
\(=897\cdot100=89700\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 542 x 7 + 542 x 2 + 542
= 542 x 7 + 542 x 2 + 542 x 1
= 542 x (7 + 2 + 1)
= 542 x 10
= 5420
b) (126 x 35 + 157 x 55) x (132 - 6 x 22)
= (126 x 35 + 157 x 55) x (132 - 132)
= (126 x 35 + 157 x 55) x 0 (Số bất kỳ nào nhân với 0 vẫn = 0)
= 0
c) 897 x 99 + 897
= 897 x 99 + 897 x 1
= 897 x (99 + 1)
= 897 x 100
= 89700
a) \(542.7+542.2+542\)
\(=542.\left(2+7+1\right)\)
\(=542.10=5420\)
b) \(\left(126.35+157.55\right).\left(132-6.22\right)\)
\(=13045.0=0\)
c) \(897.99+897\)
\(=897.\left(99+1\right)\)
\(=897.100=89700\)
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25 + 25 x 3
= 25 x ( 1 + 3 )
= 25 x 4
= 100
35 + 45 + 55 + 65
= ( 35 + 65 ) + ( 45 + 55 )
= 100 + 100
= 200
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A, 4655 +2033 + 2567
=4655+(2033+2567)
=4655+4600
= 9255
b, 200-5-15-25-35-45-5
= 200-(5 +15+25+35+45+55)
= 200-180
=20
k cho mình nha bạn !!!
A.4655+2033+2567
=4655+(2033+2567)
=4655+4600
=9255
B.200-5-15-25-35-45-55
=200-(5+15+25+35+45+55)
=200-180
=20
![](https://rs.olm.vn/images/avt/0.png?1311)
10 + 99 + 1 + 55 + 45 + 65 + 35
= (99 + 1) + (55 + 45) + (65 + 35) + 10
= 100 + 100 + 100 + 10
= 310
mk k pạn rùi
k lại mk nha
ccamr ơn trước
10 + 99 + 1 + 55 + 45 + 65 + 35
= 10 + 100 + 100 + 100
= 310
4 + 35/55 = 51/11 nha bạn
\(4+\frac{35}{55}\)
\(=\frac{51}{11}\)