giải giúp mik với cảm các bạn nhiều =((
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\(g,4=2^2;6=2.3\\ \Rightarrow BCNN\left(4,6\right)=2^2.3=12\\ \Rightarrow x\in BC\left(4,6\right)=B\left(12\right)=\left\{0;12;24;36;48;60;...\right\}\\ \text{Mà }0< x< 50\\ \Rightarrow x\in\left\{12;24;36;48\right\}\\ h,12=2^2.3;18=2.3^2\\ \Rightarrow BCNN\left(12,18\right)=2^2.3^2=36\\ \Rightarrow x\in BC\left(12,18\right)=B\left(36\right)=\left\{0;36;72;108;144;180;216;252;...\right\}\\ \text{Mà }x< 250\\ \Rightarrow x\in\left\{0;36;72;108;144;180;216\right\}\)
g,\(x⋮4,x⋮6\Rightarrow x\in BC\left(4,6\right)=\left\{\pm0;\pm12;\pm24;\pm36;\pm48;\pm60;...\right\}\)
Mà \(0< x< 50\Rightarrow x\in\left\{12;36;48\right\}\)
h,\(x⋮12,x⋮18\Rightarrow x\in BC\left(12,18\right)=\left\{0;\pm36;\pm72;\pm108;\pm144;\pm180;\pm216;\pm252;...\right\}\)
Mà \(x< 50\Rightarrow x\in\left\{0;\pm36;\pm72;\pm108;\pm144;\pm180;\pm216\right\}\)
đưa 274 và -4 ra ngoài
=274x(1+99)-4x(48+52)
=274x100-4x100
=100x(274-4)
=100x270
=27000
= 35 . 34 + 35 . 38 + 65 . (-75 ) + 65 . ( -45 )
= 35 . ( 34 + 38 ) + 65 . ( -75 - 45 )
= 35 . 72 + 65 . ( -120 )
= 2520 - 7800
= -5280
35.34+(-35).(-38)+65.(-75)+(-65).45
= 35 . 34 + 35 . 38 + 65 . (-75 ) + 65 . ( -45 )
= 35 . ( 34 + 38 ) + 65 . ( -75 - 45 )
= 35 . 72 + 65 . ( -120 )
= 2520 - 7800
= -5280
xin like
Bài 4: Tìm x
a. \(\left(2x-5\right)+17=6\)
\(2x-5=6-17\)
\(2x-5=-11\)
\(2x=-11+5\)
\(2x=-6\)
\(x=-3\)
b.\(10-2\left(4-3x\right)=-4\)
\(-2\left(4-3x\right)=-4-10\)
\(-8+6x=-14\)
\(6x=-6\)
\(x=-1\)
c. \(-12+3\left(-x+7\right)=-18\)
\(3\left(-x+7\right)=-18+12\)
\(-3x+21=-6\)
\(-3x=-27\)
\(x=9\)
d.\(24:\left(3x-2\right)=-3\)
\(24:\left(-3\right)=3x-2\)
\(-8=3x-2\)
\(-6=3x\)
\(x=-2\)
\(4x-2y-4x^2+4xy-y^2\)
\(=\left(4x-2y\right)-\left(4x^2-4xy+y^2\right)\)
\(=2\left(2x-y\right)-\left(2x-y\right)^2\)
\(=\left(2x-y\right)\left(2-2x+y\right)\)