a)18.17-3.6.37

=18.17-(3.6).37

=18.17-18.37

=18.(17-37)

=18.(-20)

=-360

(-127).33+127.(-68)-(-127)

=127.(-33)+127.(-68)-(-127)

=127.[(-33)+(-68)]-(-127)

=127.(-101)-(-127)

=-12827-(-127)

=-12700

-127.33+127.(-68)-(-127)=127.(-33)+127.(-68)+127=127(-33-68+1)=127.(-100)=-12700

cảm ơn các bạn đã giúp mình

(-127) + (-33) + 80

= (-160) + 80

= (-80)

cảm ơn bạn

9700

TICK CHO MIK VỚI!

80*33+97*33+34*97+33*17

=33*(80+97+17)+34*97

=33*194+34*97

=33*97*2+34*97

=97*(33*2+34)

=97*100

=9700

tik mik nha bn

  80*33+97*33+34*97+33*17

=33*(80+17)+97*(33+34)

=33*97+97*67

=97*(33+67)

=97*100=9700

(7/111 - 4/33 + 9/37).(1/2 - 1/3 -1/6)

= (7/111 - 4/33 + 9/37).0

= 0

(7/111 - 4/33 + 9/37).(1/2 - 1/3 - 1/6)

= (7/111 - 4/33 + 9/37).0

= 0

Sửa đề:

\(\frac{1}{33}\times\left(\frac{33}{12}+\frac{3333}{2020}+\frac{333333}{303030}+\frac{33333333}{42424242}\right)\)

\(=\frac{1}{33}\times\frac{33}{12}+\frac{1}{33}\times\frac{3333}{2020}+\frac{1}{33}\times\frac{333333}{303030}+\frac{1}{33}\times\frac{33333333}{42424242}\)

\(=\frac{1}{12}+\frac{33\times101}{33\times101\times20}+\frac{33\times10101}{33\times10101\times30}+\frac{33\times1010101}{33\times1010101\times42}\)

\(=\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}\)

\(=\frac{1}{3x4}+\frac{1}{4x5}+\frac{1}{5x6}+\frac{1}{6x7}\)

\(=\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}\)

\(=\frac{1}{3}-\frac{1}{7}\)

\(=\frac{4}{21}\)