Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
32 . 41+ 46.73 + 32.59 +73.54
=32.(41+59)+73.(46+54)
=32.100+73.100
=100.(32+73)
=100.105 = 10500
32*41+46*73+32*59+73*54
=(32*(41+59))+(73*(54+46))
=(32*100)+(73*100)
=3200+7300
=11500 k cho minh nha thuuuuuuuuuuu
- Giải:
a) 29 + ( 132 + 868 ) + ( 237 + 763 )
= 29 + ( 1000 + 1000 )
= 29 + 2000 = 2029
b) 652 + 327 + 148 + 15 + 73
= ( 652 + 148 ) + ( 327 + 73 ) + 15
= ( 800 + 400 ) + 15 = 1215
-------Phần còn lại nhờ mấy bn khác lm hộ nhé-------
a) 29 + 132 + 237 + 868 + 763
= 29 + (132 + 868) + (237 + 763)
= 29 + 1000 + 1000
= 2029
b) 652 + 327 + 148 + 15 + 73
= (652 + 148) + (327 + 73) + 15
= 800 + 400 + 15
= 1215
c) 35 . 24 + 35 . 38 + 65 . 75 + 45 . 65
= 35(24 + 38) + 65(75 + 45)
= 35 . 62 + 65 . 120
= 5 . 7 . 2 . 31 + 65 . 12 . 10
= 10 . 7 . 31 + 65 . 12 .10
= 10(7 . 31 + 65 . 12)
= 10(217 + 780)
= 10 . 997
= 9970
d) 3 . 25 + 4 . 37 . 6 + 2 . 38 . 12
= 3 . 25 + 4 . 37 . 2 . 3 + 2 . 38 . 12
= 3 . 25 + 12 . 37 . 2 + 2 . 38 . 12
= 3 . 25 + 12 . 2(37 + 38)
= 3 . 25 + 12 . 2 . 75
= 3 . 25 + 12 . 2 . 3 . 25
= 3 . 25(1 + 12 . 2)
= 3 . 25 . 25
= 1875
5x + 3(10-x) + x = 45
5x + 3.10 - 3.x + x = 45
5x - 3x + x + 30 = 45
3x = 45-30
3x = 15
x = 15:3
x = 5
Vậy x = 5
\(5\cdot x+10\cdot9=990\)
\(\Rightarrow5\cdot x+90=990\)
\(\Rightarrow5\cdot x=900\)
\(\Rightarrow x=\dfrac{900}{5}\)
\(\Rightarrow x=180\)
_____________
\(1045:\left[215-\left(3\cdot x-24\right)\right]=5\)
\(\Rightarrow215-\left(3\cdot x-24\right)=1045:5\)
\(\Rightarrow215-\left(3\cdot x-24\right)=209\)
\(\Rightarrow3\cdot x-24=215-209\)
\(\Rightarrow3\cdot x-24=6\)
\(\Rightarrow3\cdot x=30\)
\(\Rightarrow x=10\)
`@` `\text {Ans}`
`\downarrow`
`5.x + 10.9 = 990`
`\Rightarrow 5x + 90 = 990`
`\Rightarrow 5x = 990 - 90`
`\Rightarrow 5x = 900`
`\Rightarrow x = 900 \div 5`
`\Rightarrow x = 180`
Vậy, `x = 180`
\(1045 \div [ 215 - (3 . x - 24 ) ] = 5\)
`\Rightarrow 1045 \div (215 - 3x + 24) = 5`
`\Rightarrow 191 + 3x = 1045 \div 5`
`\Rightarrow 191 + 3x = 209`
`\Rightarrow 3x = 209 - 191`
`\Rightarrow 3x =18`
`\Rightarrow x = 18 \div 3`
`\Rightarrow x = 6`
Vậy, `x = 6.`
\(445-52+155+452\\ =\left(445+155\right)+\left(452-52\right)\\ =600+4000\\ =1000\\ 102\cdot55-102\cdot73+51\cdot36\\ =102\cdot\left(55-73\right)+51\cdot36\\ =102\cdot\left(-18\right)+102\cdot18\\ =0\\ 4\cdot5\cdot2\cdot25\cdot5-1000\\ =5000-1000\\ =4000\\ 8782-291\cdot13\\ =4999\\ 254+\left\{38\cdot\left[\left(42-16\right):2\right]\right\}\\ =254+\left[38\cdot\left(26:2\right)\right]\\ =254+\left(38\cdot13\right)\\ =748\\ \left(2791\cdot34+7882:14\right)\cdot0+1510-510:2\\ =1510-255\\ =1255\)
a. \(445-52+155+452=\left(445+155\right)+\left(452-52\right)=600+400=1000\)
b. \(102\cdot55-102\cdot73+51\cdot36=102\left(55-73+18\right)=102\cdot0=0\)
c.\(4\cdot5\cdot2\cdot25\cdot5-1000=4\cdot25\cdot5\cdot5\cdot2-1000=100\cdot50-1000=5000-1000=4000\)
d. \(8782-291\cdot13=8782-3783=4999\)
e. \(254+\left\{38\left[\left(42-16\right)\div2\right]\right\}=254+\left\{30\cdot13\right\}=254+494=748\)
f. \(\left(2791\cdot34+7882\div14\right)\cdot0+1510-510\div2=0+1510-255=1255\)\
a)\(5^{2x-3}-2\cdot5^2=5^2\cdot3\)
\(5^{2x-3}-2\cdot25=75\)
\(5^{2x-3}-50=75\)
\(5^{2x-3}=125\)
\(125=5^3\)
\(5^3=5^{\left(3+3\right):2}=5^3\Rightarrow x=3\)
Vậy \(x=3\)
b)\(\frac{2}{9}\cdot\left(5x+1\right):2-\frac{1}{18}=\frac{5}{36}\)
\(=\frac{2}{9}\cdot\left(5x+1\right):2=\frac{5}{36}+\frac{1}{18}\)
\(=\frac{2}{9}\cdot\left(5x+1\right)=\frac{7}{36}\cdot2\)
\(5x+1=\frac{7}{18}:\frac{2}{9}\)
\(x=\left(\frac{7}{4}-1\right):5=\frac{3}{20}\)
\(\Rightarrow x=\frac{3}{20}\)
a, \(5^{2x-3}-2.5^2=5^2.3\)
\(\Leftrightarrow5^{2x-3}-2.25=25.3\)
\(\Leftrightarrow5^{2x-3}-50=75\)
\(\Leftrightarrow5^{2x-3}=125\)
\(\Leftrightarrow5^{2x-3}=5^3\)
\(\Leftrightarrow2x-3=3\)
\(\Leftrightarrow2x=6\)
\(\Leftrightarrow x=3\)
b, \(\frac{2}{9}.\left(5x+1\right):2-\frac{1}{18}=\frac{5}{36}\)
\(\Leftrightarrow\frac{2}{9}.\left(5x+1\right):2=\frac{7}{36}\)
\(\Leftrightarrow\frac{2}{9}.\left(5x+1\right)=\frac{7}{36}.2\)
\(\Leftrightarrow\frac{2}{9}.\left(5x+1\right)=\frac{7}{18}\)
\(\Leftrightarrow5x+1=\frac{7}{18}:\frac{2}{9}\)
\(\Leftrightarrow5x+1=\frac{7}{18}.\frac{9}{2}\)
\(\Leftrightarrow5x+1=\frac{7}{4}\)
\(\Leftrightarrow5x=\frac{3}{4}\)
\(\Leftrightarrow x=\frac{3}{4}:5=\frac{3}{4}.\frac{1}{5}=\frac{3}{20}\)
\(73\left(5x-24\right)=2.7\)
\(\Leftrightarrow5x-24=14:73=0.19178\)
\(\Leftrightarrow5x=0.19178+24=24.19178\)
\(\Leftrightarrow x=24.19178:5=4.838356\)
Vậy x=4.838356
nhầm rùi bằng 2.74