1 四则运算-2021春四年级下册数学【五星红领巾乐园】同步课堂(人教版)

书书书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`Mabcd#efg ! hi #$ jYk:lmn# " ompqr #! st < % uv`#w ! Yabc*xTUu & " CD 3# E " #$ 53# &% )$3,& E ' & ! FGHIJK $3, E # N ! LMNyA01O ! Jy9; #$,,! z; ',! {9|z% '-! y9;TU & ', &'- )$,""&#$,, +$,' 4', )%- & ! 9%' %-# !"#$% !! & " $"""" ' 3 () " A5 - -BC # 7 3$ ! ! [\./]^ # - &%% )%%"""#,, +#,, )-"""- 5$*% )-"""- 433$ )- #, +- )#, - 4'2# )- ((( 5- )- $#' &- )$#' 6 ! _`