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37.24 + 37.76 + 63 . 79 + 21 . 63
= 37 . ( 24 + 76 ) + 63 . ( 79 + 21 )
= 37 . 100 + 63 . 100
= 3700 + 6300
= 10000
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) 69.113 - 27.69 + 69.14 + 31
= 69.(113 - 27 + 14) +31
= 69.100 + 31
= 6931
c) 72.121 + 27.121 + 121
= 121.(72 + 27 + 1)
= 121.100
= 12100
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
\(2.17.12+4.6.21+8.3.62\)
\(=24.17+24.21+24.62\)
\(=24\left(17+21+62\right)\)
\(=24.100\)
\(=2400\)
\(37.24+37.76+63.79+63.21\)
\(=37\left(27+76\right)+63\left(79+21\right)\)
\(=37.100+63.100\)
\(=3700+6300\)
\(=10000\)
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)\(27.\left(13+48\right)+27.\left(22+17\right)=27.\left(13+48+22+17\right)\)
\(=27.100\)
\(=2700\)
a) \(17\cdot85+15\cdot17-120\)
\(=17\cdot\left(85+15\right)-120\)
\(=17\cdot100-120\)
\(=1700-120\)
\(=1580\)
b) \(27\cdot77+24\cdot27-27\)
\(=27\cdot\left(77+24-1\right)\)
\(=27\cdot100\)
\(=2700\)
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
=
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