20^2-4(x+41)=2×10^2
150+5(x-9)=350
5^3-5(x+4)=35
10+2×x=4^5:4^3
2.x-138=2^3.3^2
5^2+(177-x)=3^2×2^2
Các anh chị giúp em nha!????
Em camon trước ạ!!!!!
20^2-4(x+41)=2×10^2
150+5(x-9)=350
5^3-5(x+4)=35
10+2×x=4^5:4^3
2.x-138=2^3.3^2
5^2+(177-x)=3^2×2^2
Các anh chị giúp em nha!????
Em camon trước ạ!!!!!
Đáp án:
Giải thích các bước giải:
$20^2-4(x+41)=2×10^2$
$⇔400-4x-164=2×100$
$⇔236-4x=200$
$⇔4x=136$
$⇔x=34$
$150+5(x-9)=350$
$⇔150+5x-45=350$
$⇔5x+105=350$
$⇔5x=245$
$⇔x=49$
$5^3-5(x+4)=35$
$⇔125-5x-20=35$
$⇔105-5x=30$
$⇔5x=70$
$⇔x=14$
$10+2x=4^5:4^3$
$⇔10+2x=4^2=16$
$⇔2x=6$
$⇔x=3$
$2x-138=2^3.3^2$
$⇔2x-138=8.9=72$
$⇔2x=210$
$⇔x=105$
$5^2+(177-x)=3^2×2^2$
$⇔25+177-x=9×4$
$⇔202-x=36$
$⇔x=166$
+) 20^2 – 4( x + 41 ) = 2 x 10^2 +) 10 + 2x = 4^5 : 4^3
(=) 400 – 4x – 164 = 2 x 100 (=) 10 + 2x = 4^2 = 16
(=)-4x = -400 + 164 + 200 (=) 2x = 16 – 10 =6
(=)-4x = -36 =) x = 3
=) x = 9
+) 150 + 5(x – 9) = 350 +) 2x – 138 = 2^3 x 3^2
(=) 150 + 5x – 45 = 350 (=) 2x – 138 = 8 x 9 = 72
(=) 5x = 350 – 150 + 45 (=) 2x = 72 + 138 = 210
(=) 5x = 245 =) x = 105
=) x = 49
+) 5^3 – 5(x + 4) = 35 +) 5^2 + ( 177 – x ) = 3^2 x 2^2
(=) 125 – 5x – 20 = 35 (=) 25 + 177 – x = 6^2 = 36
(=) -5x = 35 – 125 + 20 (=) -x = 36 – 25 -177
(=) -5x = -70 (=) -x = -166
=) x = 14 =) x = 166