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#giải:
125 . 456 + 456 . 31 - 256 . 444
= 456 . ( 125 + 31 ) - 256 . 444
= 456 . 256 - 256 . 444
= 256 . ( 456 - 444 )
= 256 . 12
= 3072
#By_Ami
`@` `\text {Ans}`
`\downarrow`
`456 \div 2 \times 18 + 456 \div 3 - 102`
`= 456 \times 1/2 \times 18 + 456 \times 1/3 - 102`
`= 456 \times (1/2 \times 18 + 1/3) - 102`
`= 456 \times ( 9 + 1/3) - 102`
`= 456 \times 28/3 - 102`
`= 4256 - 102`
`= 4154`
`@` `\text {Ans}`
`\downarrow`
`456 \div2\times18 + 456\div3 - 102`
`= 456\times0,5\times18 + 456\times1/3 - 102`
`= 456\times (0,5 \times 18 + 1/3) - 102`
`= 456 \times(9 + 1/3) - 102`
`= 456 \times28/3 - 102`
`= 4256 - 102`
`= 4154`
456:2*18 + 456:3 - 102
= 228 * 18 + 152 - 102
= 4104 + 152 - 102
= 4104+ 50
= 4154
1482:x + 23= 80
1482: x = 80- 23
1482 : x= 57
x= 1482: 57
x= 26
học tốt!
456 :2 *18 +456:3 _102
=228x18+(456:3)-102
=4164+152-102
=4154
1482 :x +23 =80
=1482:x=80-23
=>1482:x=57
=>x=1482:57
=>x=26
chúc bạn hok tốt
\(37\times7+80\times3+34\times7\)
\(=7\times\left(37+34\right)+80\times3\)
\(=7\times71+240\)
\(=497+240\)
\(=737\)
a)
37 x 7 + 80 x 3 + 34 x 7
= 7 x (37 + 34) + 80 x 3
= 7 x 71 + 240
= 497+ 240
= 737
b)
123 x 456 + 456 x 321 - 256 x 444
= 456 x (123 + 321) - 256 x 444
= 456 x 444 - 256 x 444
= 444 x (456 - 256)
= 444 x 200
= 88800
\(456+123x=789\)
\(123x=789-456=333\)
\(x=333:123=\dfrac{111}{41}\)
(456x111+912)x37:13.74=(50616+912)x37:13.74=51528x37:13.74=1906536:13.74=138758.0786
Bài 6:
\(21,251+6,058+0,749+1,042\)
\(=\left(21,251+0,749\right)+\left(6,058+1,042\right)\)
\(=22+7,1\)
\(=29,1\)
___________________
\(1,53+5,309+12,47+5,691\)
\(=\left(1,53+12,47\right)+\left(5,309+5,691\right)\)
\(=14+11\)
\(=25\)
5:
a: =>x/17=5/17
=>x=5
b; =>6+x=7/11*33=21
=>x=15
c: \(\dfrac{12+x}{43-x}=\dfrac{2}{3}\)
=>3x+36=86-2x
=>5x=50
=>x=10
d: \(\dfrac{x}{5}< \dfrac{3}{7}\)
=>x<3/7*5
=>x<15/7
f: 15/26+x/16=46/52
=>x/16=23/26-15/26=8/26=4/13
=>x=4/13*16=64/13
1048,8
Đề của câu hỏi là gì vậy bạn?
2,3*456=2,3(450+6)
\(=2,3\cdot450+2,3\cdot6\)
\(=1035+13,8=1048,8\)