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a) 20 × 190 × 50 = (20 × 50) × 190 = 1000 × 190
= 190000
b) (900 × 28) ÷ 9 = (900 ÷ 9) × 28 = 100 × 28 = 2800
![](https://rs.olm.vn/images/avt/0.png?1311)
\(900\times28:9\\ =\left(900:9\right)\times28\\ =100\times28\\ =2800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
126 : 3 + 231 : 3 + 543 : 3
= ( 126 + 231 + 543 ) : 3
= 900 : 3
= 300
126 : 3 + 231 : 3 + 543 : 3
= \(126.\frac{1}{3}+231.\frac{1}{3}+543.\frac{1}{3}\)
=\(\frac{1}{3}\left(126+231+543\right)=\frac{1}{3}.900=300\)
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\((\frac{1}{2}+\frac{1}{4}+\frac{1}{6}) \)x \((\frac{36}{9}-\frac{12}{9}:\frac{1}{3}) \)
\(= (\frac{1}{2}+\frac{1}{4}+\frac{1}{6}) \) x \((\frac{36}{9}-\frac{36}{9})\)
\( = (\frac{1}{2}+\frac{1}{4}+\frac{1}{6}) \) x \(0\)
\(= 0\)
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Hướng dẫn giải:
a.
17 x 543 + 83 x 543
= (17 + 83) x 543
= 100 x 543
= 54300
b.
318 x 963 + 682 x 963
= (318 + 682) x 963
= 1000 x 963
= 963000
a)17x543+83x543
=(17+83)x543
=100x543
=54300
b)318x963+682x963
=(318+682)x963
=1000x963
=963000
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1+2+3+...+9
=(1+9)+(2+8)+...+5
=10+10+...+5
=10.4+5
=45
HT
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9/5 + 4/7 + 6/5 + 3/7
= ( 9/5 + 6/5 ) + ( 4/7 + 3/7)
= 3 + 1
= 4
9/5 + 4/7 + 6/5 + 3/7 = (9/5 + 6/5) + (4/7 + 3/7)
= 15/5 + 7/7
= 3 + 1
= 4
1/2 x 45/33 x 1/9 x 11/6 = (1/2 x 1/9) x (45/33 x 11/6)
= 1/18 x 45/18
= 5/2
6 650 + 9 543 + 3 250 – 9 900
= (6 650 + 3 250) + 9 542 – 9 900
= 9 900 + 9 542 – 9 900
= 9 900 – 9 900 + 9 542
= 0 + 9 542 = 9 542
6 650 + 9 543 + 3 250 – 9 900
= (6650 + 3250) + 9542 – 9900
= 9900 + 9542 – 9900
= 9900 – 9900 + 9542
= 0 + 9542 = 9542