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a) \(\frac{4}{5}=\frac{28}{35}\)
b) \(\frac{12}{15}=\frac{72}{90}\)
c) \(\frac{125}{300}=\frac{5}{12}\)
d) \(\frac{6}{9}=\frac{36}{54}\)
/HT\
a) \(\frac{4}{5}=\frac{28}{35}\) \(\text{X}=28\)
b) \(\frac{12}{15}=\frac{72}{90}\) \(\text{X}=90\)
c) \(\frac{125}{300}=\frac{5}{12}\) \(\text{X}=12\)
d) \(\frac{6}{9}=\frac{36}{54}\) \(\text{X}=6\)
( 11 x 9 - 100 +1 ) x ( 1 x 2 x ... x10 ) = (99 + 1 - 100) x 1 x 2 x .... x 10
= 0 x 1 x 2 x ....... x 10
= 0
Ta có
(11x9 -100+1)x (1x2x3x..x100)
= 0x ( 1x2x3x..x100)
=0
x x (125 -30 + 5)= 375000
x x 100 =375000
x =375000 : 100
x =3750
125.y-12.y-13.y=5208000
(125-12-13).y=5208000
100.y=5208000
y=5208000:100
y=52080
\(x\times405=86265\)
\(x=86265:405\)
\(x\text{=}213\)
\(89658:x=293\)
\(x=89658:293\)
\(x\text{=}306\)
\(x+126=480\)
\(x=480-126\)
\(x=354\)
\(x-209\text{=}435\)
\(x\text{=}435+209\)
\(x\text{=}644\)
\(x:13=200+5\)
\(x:13\text{=}205\)
\(x\text{=}205\times13\)
\(x\text{=}2665\)
\(x\times40\text{=}26000-400\)
\(x\times40=25600\)
\(x\text{=}25600:40\)
\(x\text{=}640\)
\(962456-x=342\times7\)
\(962456-x=2394\)
\(x\text{=}962456-2394\)
\(x\text{=}960062\)
(125 - 12 - 13) x X = 30 200
100 x X = 30 200
X = 30 200 : 100
X = 302
(35 + 64) x X = 400
100 x X = 400
X = 400 : 100
X = 4
k đúng cho mình nha!!