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a)\(37.24+37.76+63.79+63.21=37.\left(24+76\right)+63.\left(79+21\right)\)
\(=37.100+63.100\)
\(=\left(37+63\right).100\)
\(=100.100\)
\(=10000\)
b)\(27.\left(13+48\right)+27.\left(22+17\right)=27.\left(13+48+22+17\right)\)
\(=27.100\)
\(=2700\)
\(2.17.12+4.6.21+8.3.62\)
\(=24.17+24.21+24.62\)
\(=24\left(17+21+62\right)\)
\(=24.100\)
\(=2400\)
\(37.24+37.76+63.79+63.21\)
\(=37\left(27+76\right)+63\left(79+21\right)\)
\(=37.100+63.100\)
\(=3700+6300\)
\(=10000\)
Sửa đề
a) 37.24 + 37.76 + 63.79 + 21.63
= 37.(24 + 76) + 63.(79 + 21)
= 37.100 + 63.100
= 100.(37 + 63)
= 100.100
= 10000
b) 49 + (139 - 172 + 99) - (139 + 199 - 172)
= 49 + 139 - 172 + 99 - 139 - 199 + 172
= 49 + (139 - 139) + (172 - 172) + (99 - 199)
= 49 + 0 + 0 - 100
= -51
1 + 2 + 3 + 4 + ..... + 49 + 50(có 50 số hạng)
=51 × 25 = 1275
2 . 17 . 12 + 4 . 6 . 21 + 8 . 3 . 62
= 24 . 17 + 24 . 21 + 24 . 62
= 24 . ( 17 + 21 + 62 )
= 24 . 100 = 2400
37 . 24 + 37 . 76 + 63 . 79 + 63 . 21
= 37 . (24 + 76) + 63 . (79 + 21)
= 37 . 100 + 63 . 100
= (37 + 63 ) . 100
= 100 . 100 = 10000
2020 . 43 + 2020 . 56 + 2020
= 2020 . 43 + 2020 . 56 + 2020 . 1
= 2020 . ( 43 + 56 + 1 )
= 2020 . 100 = 202000
a,17.85+15+17-120
= 17 . (85 + 15) - 120
= 1700 - 120
= 1580
b,37.24+37.76+63.79+21.63
=37.(24+76)+63.(79+21)
=37.100+63.100
=100.(37+63)
=100.100 =10000
a) 37.24+37.76+63.79+21.63
= 37(24+76)+63(79+21)
= 37.100+63.100
= (37+63)100
= 100.100
= 10000
b) 101+(-60)+29+(-40)
= (101+29)+(-60-40)
= 130-100
= 30
c) 40+(139-172+99)-(139+199-127)
= 40+139-172+99-139-199+127
= (139-139)+(-127+127)+(99-199)+40
= 0+0-100+40
= -60
d) (158.129-158.39):180
= [158(129-39)]:180
= (150.90):180
= 75
=
câu b là:
=37.(24+76)+63.(79+21)
=37.100+63.100
=100.(37+63)
=100.100
=10000
a)=87+113+249=200+249=449
b)=268+732+79=1000+79=1079
c)=
d)=37.24+37.76=37.(24+76)=100
d) =23.56+23.44 + 77.38+77.62 =23.(56+44)+77.(38+62)=23.100+77x100=100.(77+23)=100.100=1000000
HT