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a)17.85+15.17−120a)17.85+15.17-120
⇔1445+15.17−120⇔1445+15.17−120
⇔1445+255−120⇔1445+255−120
⇔1580⇔1580
b)2³.17−2³.14b)2³.17-2³.14
⇔8.17−8.14⇔8.17−8.14 ⇔136−8.14⇔136−8.14
⇔24⇔24 c)20−[30−(5−1)²:2]c)20-[30-(5-1)²:2]
⇔20−(30−42:2)⇔20−(30−42:2)
⇔20−(30−8)⇔20−(30−8)
⇔−2⇔-2
d)80−(4.5²−3.2²)d)80-(4.5²-3.2²)
⇔80−(4.25−3.22)⇔80−(4.25−3.22)
⇔80−(100−12)⇔80−(100−12)
⇔−8⇔-8
e) 27.77+24.27−2727.77+24.27-27
⇔ 27.77+24.27−27.1⇔ 27.77+24.27-27.1
⇔27.(77+24−1)⇔27.(77+24-1)
⇔27⇔27
g)174:{2.[36+(4²−23)]}g)174:{2.[36+(4²-23)]}
⇔ 174:{2⋅[36+(16−23)]}⇔ 174:{2⋅[36+(16−23)]}
⇔174:{2⋅[36−7]}⇔174:{2⋅[36−7]}
⇔ 174:{2⋅29}⇔ 174:{2⋅29}
⇔ 174:58⇔ 174:58
⇔ 3
a)91
b)225
c)17315
d)999,11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
Ta có :
A)314:25+86:25
= (314+86):25
=400:25
= 16
B)724:4-24:4
=(724-24):4
=700:4
=175
c)(700+21):7
=700+(21:7)
=700+3
=703
d)(819-81):9
=819-(81:9)
=819-9
=810
a)
\(25\times189-25\times88-25\)
\(=25\times\left(189-88-1\right)\)
\(=25\times100\)
\(=2500\)
b)
\(38\times66-38\times56+62\times65-62\times55\)
\(=38\times\left(66-56\right)+62\times\left(65-55\right)\)
\(=38\times10+62\times10\)
\(=10\times\left(38+62\right)\)
\(=10\times100\)
\(=1000\)
c)
\(29\times69+29\times31-23\times100\)
\(=29\times\left(69+31\right)-23\times100\)
\(=29\times100-23\times100\)
\(=100\times\left(29-23\right)\)
\(=100\times6\)
\(=600\)
d)
\(\left(519\times288-516\times288\right)\div288\)
\(=288\times\left(519-516\right)\div288\)
\(=288\times3\div288\)
\(=3\)
a)
25×189−25×88−2525×189−25×88−25
=25×(189−88−1)=25×(189−88−1)
=25×100=25×100
=2500=2500
b)
38×66−38×56+62×65−62×5538×66−38×56+62×65−62×55
=38×(66−56)+62×(65−55)=38×(66−56)+62×(65−55)
=38×10+62×10=38×10+62×10
=10×(38+62)=10×(38+62)
=10×100=10×100
=1000=1000
c)
29×69+29×31−23×10029×69+29×31−23×100
=29×(69+31)−23×100=29×(69+31)−23×100
=29×100−23×100=29×100−23×100
=100×(29−23)=100×(29−23)
=100×6=100×6
=600=600
d)
(519×288−516×288)÷288(519×288−516×288)÷288
=288×(519−516)÷288=288×(519−516)÷288
=288×3÷288=288×3÷288
=3=3