B=(412*213+13*12)*(49*6-42*7) .Tìm B
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a) 42x99-21x176-35x12
=4158-3696-420
=42
b){[213^0+(999-998)^324]x2-12x5}-4^9:4^6
={[1+1^324]x2-60}-4^3
={[1+1]x2-60}-64
={2x2-60}-64
={4-60}-64
=-56-64
=-120
c)|-27|+(-25)-(-13)
=27+(-25)+13
=2+13
=15
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a) 1 3 + − 1 3 + 1 3 = 1 3
b ) − 1 3 + 2 5 + − 2 3 + 4 5 = 1 5 c ) 7 23 + 16 23 + − 5 9 + − 4 9 + − 5 8 = − 5 8 d ) − 2 9 + − 3 4 + − 1 36 + 1 3 + 3 5 + 1 5 = 0 e ) − 1 2 + − 1 9 + − 7 18 + 4 35 + 3 5 + 2 7 = 0
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Tính hợp lí
a,15.(27+ 18 +6 ) + 15.( 23 +12)
= 15(27+18+6+23+12)
= 15.86
= 1290
b,24.(15 + 49 ) + 12. ( 50 + 42 )
=12.2(15+49)+12.(50+42)
= 12(30+98)+12(50+42)
=12(30+98+50+42)
=12.220
= 2640
c,53.(51+4)+53.(49+96) +53
=53(51+4)+53(49+96)+53.1
=53(51+4+49+96+1)
=53.201
=10653
d,42.( 15 +96) +6.(25 +4).7
=42(15+96)+42(25+4)
=42(15+96+25+4)
=42.140
=5880
tick đúng cho mk nha pikachu
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\(a.=24+42+120-24-42\)
\(=\left(24-24\right)+\left(42-42\right)+120\)
\(=0+0+120\)
\(=120\)
\(b.=13-145+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-145\)
\(=0+0-145\)
\(=-145\)
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a)=>x=13+3/5=68/5.
Vậy x = 68/5
b)=>x/6=5/7+-23/42
=>x/6=1/6
=>x=1
Vậy x=1
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a) x-3/5=13
suy ra x=13+3/5
suy ra x=68/5
suy ra x=13.6
b)x/6=5/7+23/-42
suy ra x/6=1/6
suy ra x=1
d) x+11/12=2/5
suy ra x=2/5-11/12
suy ra x=-31/60
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\(B=\left(412\times213+13\times12\right)\times\left(49\times6-42\times7\right)\)
\(B=\left(412\times213+13\times12\right)\times0\)
\(B=0\)
B=(412*213+13*12)*(49*6-42*7) .Tìm B
B = 0 nha bạn