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\(\left(792,81\cdot0,25+792,81\cdot0,75\right)\cdot\left(11\cdot9-900\cdot0,1-9\right)\)
\(=792,81\cdot\left(0,25+0,75\right)\cdot\left(11\cdot9-9\cdot10-9\right)\)
\(=792,81\cdot1\cdot9\cdot\left(11-10-1\right)\)
\(=792,81\cdot9\cdot0\\ =0\)
[792,81 x (0,25 + 0,75)] x (11,9 - 90-9)
=792,81 x -87,1
=-69053,751
\(\left(123\text{ ×}0,25+123\text{ ×}0,75\right)\text{ ×}\left(11\text{ ×}9-900\text{ ×}0,1-9\right)\)
\(=\left(123\text{×}0,25+123\text{×}0,75\right)\text{ ×}\left(11\text{×}9-9\text{×}100\text{×}0,1-9\text{×}1\right)\)
\(=\left(123\text{×}0,25+123\text{×}0,75\right)\text{ ×}\left(11\text{×}9-9\text{×}10-9\text{×}1\right)\)
\(=\left[123\left(0,25+0,75\right)\right]\text{×}\left[9\text{×}\left(11-10-1\right)\right]\)
\(=\left(123\text{×}1\right)\text{×}\left(9\text{×}0\right)=123\text{×}0=0\)
\(=\left(2012x\frac{1}{4}+2012x\frac{3}{4}\right)x\left(11x9-90-9\right)\)
\(=2012x\left(\frac{1}{4}+\frac{3}{4}\right)x\left(11x9-10x9-9x1\right)\)
\(=2012x9x\left(11-10-1\right)\)
=\(2012x9x0\)
=0
Chúc bn học giỏi, k cho mình nhé!!!
= (2012 x 0,25 + 2012 x 0,75) x (99 - 90 - 9 )
= (2012 x 0,25 + 2012 x 0,75) x ( 9 - 9)
=(2012 x 0,25 + 2012 x 0,75) x 0
= 0
1,45 x 0,36 + 3,6 x 0,9 - 0,36 x 0,45
= 1,45 x 0,36 + 0,36 x 9 - 0,36 x 0,45
= 0,36 x ( 1,45 + 9 - 0,45)
= 0,36 x { (1,45-0,45) + 9}
= 0,36 x { 1 + 9}
= 0,36 x 10
= 3,6
a,\(10:x+7,19:x=3\)
\(\left(10+7,19\right):x=3\)
\(17,19:x=3\)
\(\Rightarrow x=17,19:3\)
\(\Rightarrow x=5,73\)
Vậy x=5,73
b,\(6,24:x+1,26;x=10\)
\(\left(6,24+1,26\right):x=10\)
\(7,5:x=10\)
\(\Rightarrow x=7,5:10\)
Vậy x= 0,75
a) 10:x+7,19:x=3
\(\Rightarrow\)(10+7,19):x=3
\(\Rightarrow\)17,19:x=3
\(\Rightarrow\)x=17,19:3=5,73
b) 6,24:x+1,26:x=10
\(\Rightarrow\)(6,24+1,26):x=10
\(\Rightarrow\)7,5:x=10
\(\Rightarrow\)x=7,5:10=0,75
0,9x28+1,8x36
=0,9x2x14+1,8x36
=1,8x14+1,8x360
=1,8x(14+36)
=1,8x50=90
(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
=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