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a) 142 x 12 + 42 x 18
= 142 x (12 +18)
= 142 x 30 = 4260
b) 49 x 365 - 39 x 365
= (49-39) x 365
= 10 x 365 = 3650
c) 4 x 18 x 25
= 18 x (4 x 25)
= 10 x 100 = 1800
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a) 175× 582-25 ×582
= ( 175 - 25 ) x 582
= 150 x 582
= 87300
b) 81 × 365 + 18 ×365 +365
= 81 × 365 + 18 × 365 + 365 x 1
= ( 81 + 18 + 1 ) x 365
= 100 x 365
= 36500
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a) 214 x 23 - 214 x 12 = 214 x (23-12) = 214 x 11 = 214 x 10 + 214 = 2140 +214 = 2354
b) 49 x 365 - 39 x 365 = 365 x (49-39) = 365 x 10 = 3650
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490 × 365 - 390 × 365 = 365 × (490 – 390)
= 365 × 100
= 36500
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Câu 10:
\(a,y\times7+y\times3=70\\ \Rightarrow y\times\left(7+3\right)=70\\ \Rightarrow y\times10=70\\ \Rightarrow y=7\\ b,18:y+12:y=3\\ \Rightarrow\left(18+12\right):y=3\\ \Rightarrow30:y=3\\ \Rightarrow y=10\)
câu 11:
\(a,9\times365+2\times365-365=\left(9+2-1\right)\times365=10\times365=3650\\ b,108:9-18:9=\left(108-18\right):9=90:9=10\\ c,43\times95+4\times43+43=43\times\left(95+4+1\right)=43\times100=4300\)
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490 × 365 - 390 × 365 = 365 × (490 – 390)
= 365 × 100
= 36500
![](https://rs.olm.vn/images/avt/0.png?1311)
490 × 365 - 390 × 365 = 365 × (490 – 390)
= 365 × 100
= 36500
49 × 365 - 365 × 39 = 49 × 365 - 39 × 365 = 49 - 39 × 365 = 10 × 365 = 3650
1 3 + 2 5 + 2 3 = 1 3 + 2 3 + 2 5 = 1 + 2 3 + 2 5 = 1 + 2 5 = 5 5 + 2 5 = 7 5