Bai1:Tinh mot cach hop li:
a, 30+15:3 b,50-20x2
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a) 7.8.39+56.30+14.4.31
= 56.39+56.30+56.31
= 56.(39+30+31)
= 56.100
=5600
b) 175+35-275+100
= (175-275)+100+35
= -100+100+35
= 0+35
=35
c) 350.7+140.7+7:7
= 7.(350+140)+1
= 7.490+1
= 3430+1
=3431
a) 14.50 = (14:2).(50.2) = 7.100 = 700
16.25 = (16:4).(25.4) = 4.100 = 400
b) 2100:50 = (2100.2):(50.2) = 4200:100 = 42
1400:25 = (1400.4):(25.4) = 5600:100 = 56
30-[50-(9-4)2]+20150
=30-[50-52]+20150
=30-[50-25]+20150
=30-25+20150
=30-25+1
=5+1
=6
1234.2014+2014.8766
=2014.(1234+8766)=2014.10000=20140000
\(1234.2014+2014.8766\)
\(=2014.\left(1234+8766\right)\)
\(=2014.10000\)
\(=20140000\)
a, =512 . -126 - 128 . -512
= -512 . 126 - 128 . -512
= -512.[126 - 128]
= -512.-2
=1024
b, =2155 - 174 - 2155 + 106
=2155-2155 - 174 +106
=0 - 174 +106
=-68
a) \(=512\cdot\left(2-128\right)+128\cdot512 \)
\(=512\cdot\left(2-128+128\right)\)
\(=512\cdot2=1024\)
341.67+341.16+659.83
=341.(67+16)+659.83
=341.83+659.83
=83.(341+659)
=83.1000
=83000
a: =387-87-224=300-224=76
b: =-75-25+329
=329-100=229
c: =-21-27+31+24=-48+55=7
d: =21(23+17)=21*40=840
e: =12-57+57-12
=0
f: =-6(36+64)=-6*100=-600
a, $30 + 15 : 3$
$= 30 + 5$
$= 35$
b, $50 - 20 \times 2$
$=50-40$
$=10$
a)30+15:3=30+5=35
b)50-20 x 2=50-40=10