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1/ Tìm y
a) y x 42 = 4200
y = 4200 : 42
y = 100
b) y : 42 = 200
y = 200 x 42
y = 8400
2/ Tính nhanh
a) 21 x 34 + 21 x 16
= 21 x ( 34 + 16 )
= 21 x 50
= 1050
b) 34 x 56 + 56 x 36
= 56 x ( 34 + 36 )
= 56 x 70
= 3920
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a \(\frac{x}{5}-\frac{1}{5}=\frac{15}{5}\)
\(\frac{x}{5}=\frac{15}{5}+\frac{1}{5}=\frac{16}{5}\)
\(x=\frac{16}{5}\cdot5=16\)
câu b tương tự
a)X=16.
b)y=2.
mk làm đúng thì tk nha!ko thì rút kinh nghiệm!
CHÚC MAY MẮN BN NHA
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34*56+34+43+34
=34*(56+43+1)
=34*100
=3400
15*23+15+53+15*23+15
=15*(23+53+23+1)
=15*100
=1500
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y x 1314 + y - y x 315 = 315000
y x 1314 + y x 1 - y x 315 = 315000
y x (1314 + 1 - 315) = 315000
y x 1000 = 315000
y = 315000: 1000 = 315
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60 x 3 + 3 x 40
= 3 x ( 60 + 40 )
= 3 x 100
= 300
34 x 5 + 34 x 95
= 34 x ( 5 + 95 )
= 34 x 100
= 3400
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Ta có :
757 x ( 2 + 3 )
= 757 x 5
= 3785
Ủng hộ mik nhá !!!
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1
a )
( 9407 - 7274 ) : y = 8058 : 34
2133 : y = 237
y = 2133 : 237
y = 9
b )
y x 128 - y x 17 - y x 11 = 576000
y x ( 128 - 17 - 11 ) = 576000
y x 100 = 576000
y = 576000 : 100
y = 5760
2
a )
( 125 x 36 ) : ( 5 x 9 ) =
4500 : 45 =
100
b )
1/10 + 2/10 + 3/10 + 4/10 + 5/10 + 6/10 + 7/10 + 8/10 + 9/10=
( 1/10 + 9/10 ) + ( 2/10 + 8/10 ) + ( 3/10 + 7/10 ) + ( 4/10 + 6/ 10 ) + 5/10=
1 + 1 + 1 + 1 + 0,5 =
4,
Chúc bạn học giỏi nhé !
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34 x 28 - 34 x 11 - 7 x 34
= 34 x (28 - 11 - 7)
= 34 x 10
= 340
a )
\(y+34=95-12\)
\(\Rightarrow y+34=83\)
\(\Rightarrow y=83-34\)
\(\Rightarrow y=49\)
Vậy \(y=49\)
b )
\(y\times3=9\)
\(\Rightarrow y=9:3\)
\(\Rightarrow y=3\)
Vậy \(y=3\)
~ Ủng hộ nhé
y +34=83
y=83-34=49
y=9:3=3