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a)3232+32.99+235.68-35.68=3200+32+(32.99)+235.68-35.68
=3200+(32.100)+68.(235-35)
=3200+3200+68.200
=3200+3200+13600
=6400+13600=20000
4747+47.99+245.53-53.45
=47.101+47.99+245.53-53.45
=47.(101+99)+53.(245-45)
=47.200+53.200
=200.(47+53)
=200.100
=20000
4.49.25+5.51.20
=100.49+100.51
=100.(49+51)
=100.100
=10000
101.27+27.99+6363+63.99
=101.27+27.99+63.101+63.99
=101.(27+63)+99.(27+63)
=101.90+99.90
=(101+99).90
=200.90
=18000
2003² - 2002.2003
= 2003.(2003 - 2002)
= 2003 . 1
= 2003
-------------------
7(x - 2) + 2³ = 2.5²
7(x - 2) + 8 = 2.25
7(x - 2) = 50 - 8
7(x - 2) = 42
x - 2 = 42 : 7
x - 2 = 6
x = 6 + 2
x = 8
-------------------
23 + (27 - 7.6) - (94.7 - 27.99)
= 23 + 27 - 42 - 658 + 2673
= 23 + (27 + 2673) - (42 + 658)
= 23 + 2700 - 700
= 23 + 2000
= 2023
16+(27-7.6)-94.7-27.99
=16+27-7.6-94.7-27.99
16+27(1+99)-7(6+94)=+2700-700=2016
đúng thì tk cho mk nha
a) \(64\cdot25+35\cdot25+25=25\cdot\left(64+35+1\right)=2500\)
b) \(92\cdot42+32\cdot8+5\cdot16\)
\(=8\cdot21\cdot23+16\left(16+5\right)\)
\(=8\cdot21\cdot23+16\cdot21\)
\(=8\cdot21\cdot\left(23+2\right)\)
\(=8\cdot21\cdot25\)
\(=2\cdot21\cdot4\cdot25\)
\(=42\cdot100\)
\(=4200\)
c) \(\left(42\cdot43+43\cdot57+43\right)-360:4\)
\(=\left[43\cdot\left(42+57+1\right)\right]-360:4\)
\(=4300-90\)
\(=4210\)
\(257.43-43.57+2.19.57+57.62\)
\(=43.\left(257-57\right)+38.57+57.62\)
\(=43.\left(257-57\right)+57.\left(38+62\right)\)
\(=43.200+57.100\)
\(=8600+5700\)
\(=14300\)