I cannot use my calculator!

Bài 1:

a, \(\left(3x-1\right)^3=27=3^3\)

\(\Rightarrow3x-1=3\Rightarrow3x=4\Rightarrow x=\dfrac{4}{3}\)

b, \(2^{x-2}=16=2^{4^{ }}\)

\(\Rightarrow x-2=4\Rightarrow x=6\)

c, \(3^x=9.27=3^2.3^3=3^5\)

\(\Rightarrow x=5\)

d, \(15x-899:29=194\)

\(15x-31=194\Rightarrow15x=225\Rightarrow x=15\)

Bài 2:

a, \(5^2.3^2-32:2^{2^{ }}\)\(=15^2-2^5:2^2=225-8=217\)

b, \(19.37+63.19-400\)\(=19.\left(37+63\right)-400=19.100-100.4=100.\left(19-4\right)\)

\(=100.15=1500\)

c, 205-\(\left\{102-\left[48-\left(16-14\right)^{ }3\right]\right\}\)\(=205-\left\{102-\left[48-2^3\right]\right\}=205-\left(102-40\right)\)

\(=205-62=143\)

áp dụng kiến thức tính nhanh ý

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=1275

= 1275

=1275

=1245

Có ai rảnh đâu mà đi ngồi cộng ngần đấy số ra.

300

300

= 300 

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37

=(1+37)x37:2

=703

lop 1 khong co cau nay

Kết quả là 703 nha bạn

a) 72 + 9 + 8 = ( 72 + 8 ) + 9

= 80 + 9

= 89

b)37 + 18 + 3 = ( 37 + 3 ) + 18

= 40 + 18

= 58

c) 48 + 26 + 4 = 48 + (26 + 4)

= 48 + 30

= 78

d)85 + 99 + 1 = 85 + ( 99 + 1 )

= 85 + 100 = 185

e) 67 + 98 + 33 = ( 67 + 33 ) + 98

= 100 + 98 = 198

tách ra đi 

Dài quá :(

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