B = 723. 542 / 1084
C = 46 . 34 . 95 /610
dấu chấm là dấu nhân nha
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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
1. tính nhanh
a) 64,25+35,25+25
=64,25+60,25
=(60,25+4) +60,25
=60,25+4
=64,25
\(a.64\cdot25+35\cdot25+25\)
\(=25\cdot\left(64+35+1\right)\)
\(=25\cdot100\)
\(=2500\)
\(b.58\cdot42+32\cdot58+58\cdot16\)
\(=\) \(58\cdot\left(42+32+16\right)\)
\(=58\cdot90\)
\(=5220\)
BÀI 2
\(890:x=35\left(dư15\right)\)
\(=>\left(890-15\right):x=35\)
\(875:x=35\)
\(x=875:35\)
\(x=25\)
b,c tương tự
234 - ( 34 - 20 . x ) = 100
34 - 20 . x = 234 - 100
34 - 20 . x = 134
20 . x = 34 - 134
20 . x = -100
x = -100 : 20
x = -5
\(\frac{4,8\left(1994+3996+4010\right)}{\left(\frac{99-3}{4}+1\right)\left(\frac{99+3}{2}\right)-11.25}=\frac{48000}{25.51-11.25}=\frac{48000}{1000}=48\)
\(\left(x-4\right)^9=49.\left(x-4\right)^7\\ =>\left(x-4\right)^9:\left(x-4\right)^7=49\\ =>\left(x-4\right)^2=49\\ =>\left[{}\begin{matrix}x-4=7\\x-4=-7\end{matrix}\right.\\ =>\left[{}\begin{matrix}x=11\\x=-3\end{matrix}\right.\)
(x - 4)9 = 49 . (x - 4)7
(x - 4)9 : (x - 4)7 = 49
(x - 4)2 = 72 = (-7)2
TH1 : TH2 :
(x - 4)2 = 72 (x - 4)2 = (-7)2
x - 4 = 7 x - 4 = -7
x = 7 + 4 x = -7 + 4
x = 11 x = -3
Vậy x = 11 Vậy x = -3
A. ( x - 34 ) . 15 = 0
x - 34 = 0
x = 0 + 34
x = 34
Vậy x = 34
B. 18 ( x - 16 ) = 18
x - 16 = 18 : 18
x - 16 = 1
x = 1 + 16
x = 17
Vậy x = 17
A. ( x - 34 ) . 15 = 0
x - 34 = 0 . 15
x - 34 = 0
x = 34
B . 18 . ( x - 16 ) = 18
x - 16 = 18 : 18
x - 16 = 1
x = 17
\(34\left(2x-6\right)=0\)
\(2x-6=0\)
\(2x=6\)
\(x=3\)
T i c k mk nha ^^
\(\text{a/96-3(x+1)=42}\)
\(3\left(x+1\right)=54\)
\(x+1=54:3\)
\(x+1=18\)
\(\Rightarrow x=17\)
\(\text{b/2.x-18=20}\)
\(2x=38\)
\(x=38:2\)
\(x=19\)
\(\text{c/134-5.(x+4)=34}\)
\(5\left(x+4\right)=100\)
\(x+4=100:5\)
\(x+4=20\)
\(\Rightarrow x=16\)
học tốt
\(B=\frac{72^3.54^2}{108^4}\)
\(B=\frac{2^9.3^6.2^2.3^6}{2^8.2^{12}}=2^3=8\)
B = 8
..............
mik nha