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3.18.25 + 3.41.16 + 6.2.8.17
= 3.18.25 + 3.16.41 + (6.8).(2.17)
= 48.25 + 48.41 + 48.34
= 48.(25 + 41 + 34)
= 48.100
= 4800
`@` `\text {Ans}`
`\downarrow`
`2.24.25 + 3.41.16 + 6.2.8.17`
`= 48*25 + 48*41 + 48*2*17`
`= 48*(25+41+2*17)`
`= 48*(66+34)`
`= 48*100 `
`= 4800`
2.24.25 + 3.41.16 + 6.2.8.17
= ( 2.24 ).25 + ( 3.16 ).41 + ( 6.8 ) + ( 2.17 )
= 48 . 25 + 48 .41 + 48 . 34
= 48. ( 25 + 41 + 34 )
= 48 . 100
= 4800
4.25.14+2.17.50+20.19.15
=100.14+100.17+20.19.3.5
=100.14+100.17+100.19.3
=100.14+100.17+100.57
=100.(14+17+57)
=100.88
=8800
Nhớ
a) 86 + 357 + 14 = (86 + 14) + 357
= 100 + 357
= 457
b) 25 . 13 . 4 = (25 . 4) . 13
= 100 . 13
= 1300
c) 28 . 64 + 28 . 36 = 28 . (64 + 36)
= 28 . 100
=2800
a) 86 + 357 + 14
= ( 86 + 14 ) + 357
= 100 + 537
= 637
b)25 . 13 . 4
= ( 25 . 4 ) . 13
= 100 . 13
= 1300
c) 28 . ( 64 + 36 )
= 28 . 100
= 2800
\(2.24.25+3.31.16+6.2.8.17\)
\(=48.25+48.31+48.34\)
\(=48.\left(25+31+24\right)\)
\(=48.90\)
\(=4320\)
1) 33 + 18 + 22 + 17
= (33 + 17) + (18 + 22)
= 50 + 40 = 90
2) 101 + 778 + 583 + 299 + 17
= (101 + 299) + (583 + 17) + 778
= 400 + 600 + 778
= 1000 + 778 = 1778
3) 25.13.4 + 2.17.50
= 100.13 + 100.17
= 100.(13 + 17)
= 100.30 = 3000
4) 34.50 = 17.2.50 = 17.100 = 1700
5) 24.25 = 24.5.5 = 100.5 = 500
6) 32.125 = 4.8.125 = 4.1000 = 4000
7) 25.9.11.4 = (25.4).(9.11) = 100.99 = 9900
8) 8.14.125.5 = (8.125).(14.5) = 1000.70 = 70000
9) 4.27.25.10 = (4.25).(27.10) = 100.270 = 27000
10) 16.125.23 = 2.8.125.23 = (2.23).(8.125) = 46.1000 = 46000
11) 375 + 693 + 625 + 307
= (375 + 625) + (693 + 307)
= 1000 + 1000 = 2000
12) 238 + 634 + 672
= (238 + 672) + 634
= 910 + 634 = 1544
13) 586 + 47 + 414
= (586 + 414) + 47
= 1000 + 47 = 1047
14) 237 + 301 + 183 + 129
= (237 + 183) + (301 + 129)
= 420 + 430 = 850
15) 123.23 + 123.11 + 123.65 + 123
= 123.(23 + 11 + 65 + 1)
= 123.100 = 12300
Câu 15 bạn ghi thừa 123.11 phải không?
25 . 13 . 4 + 2 . 17 . 50
= 25 . 13 + 2 . 17 . 25 . 2
= 25 . 13 +
=100.13+100.17=(13+17).100=30.100=3000
b)=2.48+48.41+48.34
=48.(2+41+34)
=48.77
=3696