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42 . 16 - 42 . 5 + 42 . 89
= 42 . ( 16 - 5 + 89 )
= 42 . 100
= 4200
Duyệt nha bạn !!!! Thank you
MÌNH SẼ GIÚP BẠN GIẢI BÀI TOÁN NÀY MỘT CÁCH DỄ HIỂU LẠI ĐƠN GIẢN NỮA !!
42 . 16 - 42. 5 + 42 . 89
= 42 (16 - 5 + 89)
=42 . ( 11 + 89)
= 42 . 100
= 4200
Vậy kết quả của phép tính này là 4200
CHÚC BẠN NGÀY CÀNG HỌC GIỎI NHÉ !
ĐỪNG QUÊN CHỌN ĐÁP ÁN CỦA MÌNH NHA !!
42.16-42.5+42.89-1200
=42.(16-5+89)-1200
=42.100-1200
=4200-1200
=3000
1, 4[3x + 4] = 12x + 16
2, 4/3[5/3x + 6] = 20/9x + 12
3, [4/3x + 7]. 5 + 2 = 20/3x + 35 + 2 = 20/3x + 37
4, [3/7x - 6][-7] + 3x = -3x + 42 + 3x = 42
\(180:\left\{\left(-30\right)+\left[4^2.5-\left(14+3^{11}:3^9\right)\right]\right\}\)
\(=180:\left\{\left(-30\right)+\left[16.5-\left(14+3^{11}.\dfrac{1}{3^9}\right)\right]\right\}\)
\(=180:\left\{\left(-30\right)+\left[80-\left(14+3^2\right)\right]\right\}\)
\(=180:\left\{\left(-30\right)+\left[80-\left(14+9\right)\right]\right\}\)
\(=180:\left[\left(-30\right)+80-23\right]\)
\(=180:27\\ =\dfrac{20}{3}\)
a) \(x-2=-6\)
\(x=-6+2\)
\(x=-4\)
b) \(15-\left(x-7\right)=-21\)
\(x-7=36\)
\(x=43\)
c) \(4.\left(3x-4\right)-2=18\)
\(4\left(3x-4\right)=20\)
\(3x-4=5\)
\(3x=9\)
\(x=3\)
d) \(\left(3x-6\right)+3=32\)
\(3x-6=29\)
\(3x=29+6\)
\(3x=35\)
\(x=\frac{35}{3}\)
e) \(\left(3x-6\right).3=32\)
\(3x-6=\frac{32}{3}\)
\(3x=\frac{32}{3}+6\)
\(3x=\frac{50}{3}\)
\(x=\frac{50}{9}\)
f) \(\left(3x-6\right):3=32\)
\(3x-6=96\)
\(3x=102\)
\(x=34\)
g) \(\left(3x-6\right)-3=32\)
\(3x-6=35\)
\(3x=41\)
\(x=\frac{41}{3}\)
h) \(\left(3x-2^4\right).7^3=2.7^4\)
\(\left(3x-2^4\right)=2.7=14\)
\(\left(3x-16\right)=14\)
\(3x=14+16=30\)
\(x=10\)
i) \(\left|x\right|=\left|-7\right|\)
\(\left|x\right|=7\)
\(\Rightarrow\orbr{\begin{cases}x=7\\x=-7\end{cases}}\)
k) \(\left|x+1\right|=2\)
\(\Rightarrow\orbr{\begin{cases}x+1=2\\x+1=-2\end{cases}\Rightarrow\orbr{\begin{cases}x=1\\x=-3\end{cases}}}\)
l) \(\left|x-2\right|=3\)
\(\Rightarrow\orbr{\begin{cases}x-2=3\\x-2=-3\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-1\end{cases}}}\)
m) \(x+\left|-2\right|=0\)
\(x+2=0\)
\(x=-2\)
o) \(72-3\left|x+1\right|=9\)
\(3\left|x-1\right|=63\)
\(\left|x-1\right|=21\)
\(\Rightarrow\orbr{\begin{cases}x-1=21\\x-1=-21\end{cases}\Rightarrow\orbr{\begin{cases}x=22\\x=-20\end{cases}}}\)
p) Ta có: \(\left|x-1\right|=3\)
\(\Rightarrow\orbr{\begin{cases}x-1=3\\x-1=-3\end{cases}}\)
mà \(x+1< 0\)
\(\Rightarrow x-1=-3\)
\(\Rightarrow x=-2\)
q) \(\left(x-2\right)\left(x+4\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-2=0\\x+4=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=-4\end{cases}}}\)
hok tốt!!
19 22 25 28 5(3x + 2) – 4(2x +3) x*(1 + 2x) 4(1 + x) – 3(2x-5) 4x–8(6) - X) 23/ ... 2x” – 4x + 3x – 6 = 2x” – X-6 (b) (x-3) = (x-3)(x-3) (c) (2x+y)(2x–y) = x* = x* – 3x ... (x - 6)” 7 (3x + 5)(x-6) 8 (8x + 2)(3x + 4) (4x – 1)(2x – 3) 10 (2x +5)* 11 (8x – 3)(2x + ... 27 (4x + 3y)(x + y) 28 (2x + 5)(5x – 2) (4x – 3y)(4x + y) 30 (7x + 2y)(3x + 4y) 24/ ...
\(a)=3x\cdot\left(2x-7-4x+5\right)=3x\cdot\left(-2x-2\right)=3x\cdot\left[-2\cdot\left(x+1\right)\right]\)
\(\left(3x-6\right)^2+\left(3x-6\right)^3=0\)
\(\left(3x-6\right)^2\cdot\left(1+3x-6\right)=0\)
\(\left(3x-6\right)^2\cdot\left(3x-5\right)=0\)
\(\orbr{\begin{cases}3x-6=0\\3x-5=0\end{cases}\Rightarrow\orbr{\begin{cases}x=2\\x=\frac{5}{3}\end{cases}}}\)
(3x-6)2+(3x-6)3=0
2.(3x-6)2=0
(3x-6)2=0:2=0
(3x-6)2=02
3x-6=0
3x=6
x=2
Bài làm:
Ta có: \(42.5-\left(3x+6\right)=3^4\)
\(\Leftrightarrow210-3x-6=81\)
\(\Leftrightarrow3x=123\)
\(\Rightarrow x=41\)
\(42.5-\left(3x+6\right)=\) \(3^4\)
\(\Leftrightarrow\)\(210-\left(3x+6\right)=81\)
\(\Leftrightarrow\)\(3x+6=210-81\)
\(\Leftrightarrow\)\(3x+6=129\)
\(\Leftrightarrow\)\(3x=129-6\)
\(\Leftrightarrow\)\(3x=123\)
\(\Leftrightarrow\)\(x=41\)