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a, 45 x 46 + 45 x 45 - 30 - 15= 45x( 46+45) -30 -15= 45 x 91 - 30 - 15= 4095 - 30 - 15= 4050
b, 891 x 29 + 29 x 8+ 29= 29 x ( 891 + 8+ 1)= 29 x 900= 26100
c, 73 x ( 84+17) + 27 x (74+27)= 73 x 101 + 27 x 101= 101 x ( 73+27)= 101 x 100= 10100
d, chịu
d, đề bài= 13 x ( 99 + 2) + 13 x 1001+ 11 x 1300= 13 x 101 + 13 x 1001+ 13 x 1100= 13 x ( 101 + 1001 + 1100) = 13 x 2202= 28626
\(a,35\times x-9251=7269\\ 35\times x=7269+9251\\ 35\times x=16520\\ x=16520:35\\ x=472\)
\(b,2352:x=1792:32\\ \\ 2352:x=56\\ x=2352:56\\ x=42\)
\(c,x:204=112\left(dư.22\right)\\ x=204\times112+22\\ x=22848+22\\ x=22870\)
\(d,93879:x=108\left(dư.459\right)\\ x=\left(93879-459\right):108\\ x=93420:108\\ x=865\)
\(a,35\times x-9251=7269\)
\(35\times x=7269+9251\)
\(35\times x=16520\)
\(x=16520\div35\)
\(x=472\)
y x [ 13+ 45+ 42 ] =7300
y x 100 = 7300
y = 7300 : 100 dap an day nhe
y = 73
\(\dfrac{5}{13}\) \(\times\) \(\dfrac{9}{14}\) \(\times\) \(\dfrac{28}{27}\) \(\times\) \(\dfrac{26}{35}\)
= \(\dfrac{5}{13}\) \(\times\) \(\dfrac{9}{14}\) \(\times\) \(\dfrac{14\times2}{9\times3}\) \(\times\) \(\dfrac{13\times2}{5\times7}\)
= \(\dfrac{5\times9\times14\times13}{5\times9\times14\times13}\) \(\times\) \(\dfrac{2\times2}{3\times7}\)
= 1 \(\times\) \(\dfrac{4}{21}\)
= \(\dfrac{4}{21}\)
\(13\cdot42\cdot33\cdot26\cdot35\)
\(=\left(42\cdot35\right)\cdot\left(13\cdot26\right)\cdot33\)
\(=1470\cdot338\cdot33\)
\(=16396380\)
X+35-13=38
x+35 =51
x=16
HT nha (^^)
X+35=38+13
X+35=51
X =51-35
X =16
HT