[2012x0,25+2012x0,75]x[11x9-900x0,1-9]
tính nhanh:
(792,81x0,25+792,81x0,75)x(11x9-900x0,1-9)
\(\left(792,81\cdot0,25+792,81\cdot0,75\right)\cdot\left(11\cdot9-900\cdot0,1-9\right)\)
\(=792,81\cdot\left(0,25+0,75\right)\cdot\left(11\cdot9-9\cdot10-9\right)\)
\(=792,81\cdot1\cdot9\cdot\left(11-10-1\right)\)
\(=792,81\cdot9\cdot0\\ =0\)
\(\left(792,81\times0,25+792,81\times0,75\right)\times\left(11\times9-900\times0,1-9\right)\\ =\left[792,81\times\left(0,25+0,75\right)\right]\times\left(99-90-9\right)\\ =\left(792,81\times1\right)\times\left(9-9\right)\\ =792,81\times0\\ =0\)
\( (792,81.0,25+792,81.0,75).(11.9-900.0,1-9)\)
\(=[792,81.(0,25+0,75)].(99-90-9) \)
\(=792,81.1.0\)
\(=792,81.0\)
\(=0\)
(3721x1,3+3570:35)x(11x9-900x0,1-9)
(3721 x 1,3 + 3570 : 35) x (11 x 9 - 900 x 0,1 - 9)
= (3721 x 1,3 + 3570 : 35) x ( 99 - 90 - 9)
= ( 3721 x 1,3 + 3570 : 35) x 0
= 0
(3721X1,3+3570:35)X(11X9-900X0,1-9)=(4837,3+102)X(99-90-9)
=> Vế trước nhân 0 vậy kết quả bằng 0
(729,81x25%+729,81x3/4)x(11x9-900x0,1-9)
tính giá trị biểu thức
(123x 0,25+ 123x 0,75)x ( 11x9- 900x0,1 -9)
ét ô ét cíu mik mng ơi~ Ai đúng mik tick cho nhe~~
\(\left(123\text{ ×}0,25+123\text{ ×}0,75\right)\text{ ×}\left(11\text{ ×}9-900\text{ ×}0,1-9\right)\)
\(=\left(123\text{×}0,25+123\text{×}0,75\right)\text{ ×}\left(11\text{×}9-9\text{×}100\text{×}0,1-9\text{×}1\right)\)
\(=\left(123\text{×}0,25+123\text{×}0,75\right)\text{ ×}\left(11\text{×}9-9\text{×}10-9\text{×}1\right)\)
\(=\left[123\left(0,25+0,75\right)\right]\text{×}\left[9\text{×}\left(11-10-1\right)\right]\)
\(=\left(123\text{×}1\right)\text{×}\left(9\text{×}0\right)=123\text{×}0=0\)
Tính bằng cách thuận tiện:
(792,81x0,25+792,81x0,75)x(11x9-900x0,1-9)
ai làm được mình tick
=729x(0,25+0,75)x(11x9-9.10-9)
=729x1x9x(11-10-1)
=729x9x0
=0
(792,81x0,25+792,81x0,75)x(11x9-900x0,1-9)
=792,81x(0,25+0,75)x(999-81)
=792,81x100x918
=79281x918
=72779958
tk minh nha
Bài 1.Tính bằng cách thuận tiện nhất.
a(792,81x025+792,81x0,75)x(11x9-900x0,1-9).
b.3,54x73+0,23x25+3,54x27+0,17x25.
Giải
a) ( 792,81.0,25 + 792,81.0,75 ).( 11.9 - 900.0,1 - 9 )
= ( 792,81.0,25 + 792,81.0,75 ).9.(11 - 100.0,1 - 1 )
= ( 792,81.0,25 + 792,81.0,75 ).9.0
= 0
b) 3,54.73 + 0,23.25 + 3,54.27 + 0,17.25
= ( 3,54.73 + 3,54.27 ) + ( 0,23.25 + 0,17.25 )
= 3,54.( 73 + 27 ) + 25.( 0,23 + 0,17 )
= 3,54.100 + 25.0,4
= 354 + 10
= 364
Tính nhanh
( 792,81x0,25+792,81x0,75 ) x ( 11,9-900x0,1-9 ) =
[792,81 x (0,25 + 0,75)] x (11,9 - 90-9)
=792,81 x -87,1
=-69053,751
( 20,1 x 20,2 + 28,3 x 12,4) x ( 11x9-900 x 0,1 - 9)
(20,1 . 20,2 + 28,3 . 12,4) . (11 . 9 - 900 . 0,1 - 9)
= ( 20,1 . 20,2 + 28,3 . 12,4) . 0
= 0
(11x9-100+1) x (1x2x...x10)