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a: \(=23\cdot100+300=2600\)
b: \(=300:\left(4+6\right)-25=30-25=5\)
b: \(=12\left(35\cdot173+27\right)\)
\(=12\cdot6082=72984\)
321- 21. [(2.3^3+4^4 :32)]- 52
=321- 21. [(2.27+256 :32)]- 52
=321-21.[(54+8)]-52
=321-21.62-52
=321-1203-52
=-754
= 300 . [(54 + 256 : 32) - 52
= 300 . [(54 + 8) - 52 ]
= 300 . (62 - 52)
= 300 . 10
= 3000
nhớ ôn lại kiến thức đi e ơi :)))
\(73\cdot5^2+5^{28}-5^2\)
\(=72\cdot5^2+5^{28}\)
\(=5^2\left(5^{26}+72\right)\)
a) 100:{250:[450−(4.53−25.4)]}100:{250:[450−(4.53−25.4)]}
=100:{250:[450−(4.125−25.4)]}=100:{250:[450−(4.125−25.4)]}
=100:{250:[450−(500−100)]}=100:{250:[450−(500−100)]}
=100:[250:(450−400)]=100:[250:(450−400)]
=100:(250:50)=100:(250:50)
=100:5=100:5
=20=20
b) 4(18−15)−(5−3).324(18−15)−(5−3).32
=4.3−2.32=4.3−2.32
=4.3−2.9=4.3−2.9
=12−18=12−18
=−6=−6
1/13.58.4+32.26.2+52.10
=52.58+52.32+52.10
=52(58+32+10)=52.100=5200
2/15.37.4+120.21+21.5.12
=60.37+120.21+60.21
=60(37+2.21+21)=60.100=6000
\(=321-21\cdot\left[2\cdot27+256:32-52\right]\)
\(=321-21\cdot10=321-210=111\)