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1) 2-2+2-2=0;2/2*2/2=1;2/2+2/2=2;2-2/2+2=3;2+2-2+2=4;2+2+2/2=5;2*(2/2+2)=6;2+2+2+2=8;22/2-2=9;(22-2)/2=10
(còn số 7 không làm được)
2) a) \(52\cdot\frac{y}{78}=3380\)
\(52\cdot\frac{1}{78}\cdot y=3380\)
\(\frac{2}{3}\cdot y=3380\)
\(y=3380\div\frac{2}{3}=5070\)
b)\(55-y+33=76\)
\(88-y=76\)
\(y=88-76=12\)
3)\(3,54\cdot73+0,23\cdot25+3,54\cdot27+0,17\cdot25\)
\(=3,54\cdot\left(73+27\right)+25\cdot\left(0,27+0,13\right)\)
\(=3,54\cdot100+25\cdot0,4\)
\(=354+10=364\)
52 \(\times\) ( y : 78) = 3380
y : 78 = 3380: 52
y : 78 = 65
y = 65 \(\times\) 78
y = 5070
y: 55 - y + 33 = 76
\(y\) \(\times\) ( \(\dfrac{1}{55}\) - 1) = 76 - 33
y \(\times\) ( \(\dfrac{-54}{55}\) ) = 43
y = 43 : (- \(\dfrac{54}{55}\))
y = - \(\dfrac{2365}{54}\)
\(a,5\frac{1}{4}+3,25-50\%+y=15,25\)
\(\Leftrightarrow5,25+3,25-\frac{50}{100}+y=15,25\)
\(\Leftrightarrow5,25+3,25-0,5+y=15,25\)
\(\Leftrightarrow8+y=15,25\)
\(\Leftrightarrow y=15,25-8=7,25\)
\(b,(y-3):2=2010\)
\(\Leftrightarrow y-3=4020\)
\(\Leftrightarrow y=4023\)
55 – y + 33 = 76
55 - y = 76 – 33
55 - y = 43
y = 55 – 43
y = 12
55-y+33=76
55-y=76-33
55-y=43
y=56-43
y=13
55 - y + 33 = 76
(55 + 33) - y = 76
88 - y = 76
y = 88 - 76
y = 12
bài 1
a, X/Y x 1/5=3/10
X/Y=3/10:1/5
X/Y=3/2
b, 3/4 x X/Y= 6/5
X/Y=3/4:6/5
X/Y=5/8
Bài 2:
a, > b, < c,= d,<
a. \(\frac{7}{3}\)+ \(\frac{2}{5}\): y = \(1\frac{1}{3}\)
\(\frac{2}{5}\): y = -1
y = \(-\frac{2}{5}\)
b. 52(y : 78) = 3380
y : 78 = 65
y = 5070
c. 55 - y + 33 = 76
55 - y = 76 - 33
y = 55 - 43
y = 12