tính tỉ số A=4/7.31+6/7.41+9/10.41+7/10.57 B=7/19.31+5/19.43+3/23.43+11/23.57 29/10/2021 Bởi Valerie tính tỉ số A=4/7.31+6/7.41+9/10.41+7/10.57 B=7/19.31+5/19.43+3/23.43+11/23.57
$A=\frac{4}{7}.31+\frac{6}{7}.41+\frac{9}{10}.41+\frac{7}{10}.57$ $A=(\frac{4}{7}+\frac{6}{7}+\frac{9}{10}+\frac{7}{10}).(31+41.2+57)$ $A=(\frac{10}{7}+\frac{8}{5}).170$ $A=\frac{116}{35}.170$ $A=\frac{19720}{35}=\frac{3944}{7}$ Bình luận
$A=\frac{4}{7}.31+\frac{6}{7}.41+\frac{9}{10}.41+\frac{7}{10}.57$
$A=(\frac{4}{7}+\frac{6}{7}+\frac{9}{10}+\frac{7}{10}).(31+41.2+57)$
$A=(\frac{10}{7}+\frac{8}{5}).170$
$A=\frac{116}{35}.170$
$A=\frac{19720}{35}=\frac{3944}{7}$