35*(7+5)-70=35*12-70=420-70=350

\(=\dfrac{75:25}{100:25}+\dfrac{18}{21}+\dfrac{19}{32}+\dfrac{1}{4}+\dfrac{3}{21}+\dfrac{13}{32}\\ =\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{18}{21}+\dfrac{3}{21}\right)+\left(\dfrac{19}{32}+\dfrac{13}{32}\right)\\ =1+1+1=3\)

= (19/32+13/32) + (18/21+3/21) + 75/100+1/4

= 1+1+75/100+1/4

= 2+75/100+1/4

= 11/4+1/4

= 3

Đáp án là 3 nha em

\(\frac{75}{100}+\frac{18}{21}+\frac{19}{32}+\frac{1}{4}+\frac{3}{21}+\frac{13}{32}\)

\(=\left(\frac{75}{100}+\frac{1}{4}\right)+\left(\frac{18}{21}+\frac{3}{21}\right)+\left(\frac{19}{32}+\frac{13}{31}\right)\)

\(=1+1+1\)

\(=3\)

Có những phân số chưa tối giản. Tuy nhiên vì đây là bài tính nhanh nên sẽ không rút gọn hết. Xíu quy đồng lại nữa :( Nên chọn lựa ra thôi.

\(\frac{75}{100}=\frac{3}{4}\)

Viết lại có: \(\frac{3}{4}+\frac{18}{21}+\frac{19}{32}+\frac{1}{4}+\frac{3}{21}+\frac{13}{32}\)

          \(=\left(\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{18}{21}+\frac{3}{21}\right)+\left(\frac{19}{32}+\frac{13}{32}\right)\)

          \(=1+1+1\) 

          \(=3\)

= 3 nha banj

75/100+18/21+19/32+1/4+3/21+13/32

=(75/100+1/4)+(18/21+3/21)+(19/32+13/32)

=1+1+1=3

75/100+18/21+19/32+1/4+3/21+13/32

=1/4+75/100+19/32+13/32+3/21+18/21

=1+1+1=3

minh cho ban 1 k nhe 

75/100+18/21+19/32+1/4+3/21+13/32=3 ban nhe!

ung ho nhe!

=3 nha bạn

nếu đung k mình nha

kb vs mk rùi mk giải cho

\(\frac{75}{100}+\frac{18}{21}+\frac{19}{32}+\frac{1}{4}+\frac{3}{21}+\frac{13}{32}\)

\(=\frac{3}{4}+\frac{18}{21}+\frac{19}{32}+\frac{1}{4}+\frac{3}{21}+\frac{13}{32}\)

\(=\left(\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{18}{21}+\frac{3}{21}\right)+\left(\frac{19}{32}+\frac{13}{32}\right)\)

\(=1+1+1\)

\(=3\)

Học tốt #

\(=\frac{3}{4}+\frac{6}{7}+\frac{19}{32}+\frac{1}{4}+\frac{1}{7}+\frac{13}{32}\)

\(=\left(\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{6}{7}+\frac{1}{7}\right)+\left(\frac{19}{32}+\frac{13}{32}\right)=1+1+1=3\)