241 四年级数学专项练习系列一之练习20

241 四年级数学专项练习系列一之练习20

求□中的数,并写出计算过程

□×19=475                          □÷12=56      

□-129=357                         □ +256=120

690-□=15                          143÷□=11

□-756=344                           □÷205=48

□×18=0                             24×□=7320

637+□=2046                         □-489=984

1000-□=215                       □÷61=52

□×43=1505                       608÷□=32

998+□=1673                       □×38=1444

□÷894=1                         □-1785=785

998+□=1543                      □÷12=12

1485÷□=135                     □-698=1000

1776÷□=37           62×□=3534         □÷48=192

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