a, 298+132+237+868+763
= 298+(132+868)+(237+763)
=298+1000+1000
=298+1000×2
=298+2000
=2298
b, 35×68+35×31+35
=35×68+35×31+35×1
=35×(68+31+1)
=35×100
=3 500
c, 35×34+35×66
=35×(34+66)
=35×100
=3 500
d, ( 563+745)-(463+545)
= 563 + 745 - 463 - 545
= (563-463) + (745-545)
= 100 + 200
= 300
e, 73+86+968+914+3032
= 73+(86+914)+(968+3032)
=73+1000 + 4000
=73+5000
=5073
f, 4×8×25×1,25×27
= (4×25)×(8×1,25)×27
=100×10×27
=1000×27
=27 000
\(a,289+132+237+868+763=289+\left(132+868\right)+\left(763+237\right)\)
\(=289+1000+1000=289+2000=2289\)
\(b,=35\times\left(68+31+1\right)=35\times100=3500\)
\(c,=35\times\left(34+66\right)=35\times100=3500\)
\(d,=563+745-463-545=\left(563-463\right)+\left(745-545\right)\)
\(=100+200=300\)
\(e,=73+\left(86+914\right)+\left(968+3032\right)=73+1000+4000=5073\)
\(f,=\left(4\times25\right)\times\left(8\times1,25\right)\times27=100\times10\times27=27000\)
c, 35 × 34 + 35× 66
= 35 × (34 + 66)
= 35 × 100
= 3500
a,289+(132+868)+(237+763)
=289+1000+1000=2289
b,35x(68+31+1)=35x100=350
c,35x(34+66)=35x100=350
d,563+745-463-545=(563-463)+(745-545)=100+200=300
e,73+(84+914)+(968+3032)=73+1000+4000=5073
f,(8x1,25)x(4x25)x27=10x100x27=27000
mình nha mình nhanh nhất
\(289+132+237+868+\)\(763\)
\(=289+\left(132+868\right)+\left(237+763\right)\)
\(=289+1000+1000\)
\(=2289\)
\(35.68+35.31+35\)
\(=35.\left(68+31+1\right)\)
\(=35.100\)
\(=3500\)
\(35.34+35.66\)
\(=35.\left(34+66\right)\)
\(=35.100\)
\(=3500\)
\(\left(563+745\right)-\left(463+545\right)\)
\(=563+745-463-545\)
\(=\left(563-463\right)+\left(745-545\right)\)
\(=200+200\)
\(=400\)
\(73+68+968+914+3032\)
\(=\left(3032+968\right)+\left(914+73+68\right)\)
\(=4000+1055\)
\(=5055\)
\(4.8.25.1,25.27\)
\(=\left(4.25\right)\left(8.1,25\right).27\)
\(=100.10.27=27000\)
\(.\)là nhân nha
a,289 + 132 + 237 + 868 + 763 = 289 + ( 132 + 868 ) + ( 237 + 763 )
=289 + 1000 + 1000
=2289
b,35 x 68 + 35 x 31 + 35 = 35 x ( 68 + 31 + 1 )
= 35 x 100
= 3500
c, 35 x 34 + 35 x 66 = 35 x (34 + 66 )
= 35 x 100
= 3500
d,( 563 + 745 ) - ( 463 + 545) = 563 + 745 - 463 + 545
=( 563 - 463 ) + ( 745 + 545 )
= 100 + 1290
= 1390
e, 73 + 86 + 968 + 914 + 3032 = 73 + ( 86 + 914 ) + ( 968 + 3032)
=73 + 1000 + 4000
= 5073
f, 4 x 8 x 25 x 1,25 x 27 = ( 4 x 25 ) x ( 8 x 1,25 ) x27
= 100 x 10 x 27
= 27000
