两个不等的自然数a和b,较大的数除以较小的数,余数记为a☉b,比如5☉2=1,7☉25=4,6☉8="2." （8级）
(1)求1991☉2000,(5☉19)☉19,(19☉5)☉5;
(2)已知11☉x=2,而x小于20,求x;
(3)已知(19☉x)☉19=5,而x小于50,求x.
相关试题
直接写得数．
=
= 0.6÷
= 380×0.01=
12.5%+0.875= 20×（1﹣75%）= 9.6÷0.3= 3.8﹣（1.7+1.8）=
1﹣
= 36×（
﹣
）=
与40的
相等，求这个数．
÷
=
÷3=
×
×
=
×9×
=
÷2= 5÷
﹣
÷5= 7﹣
=（1.6+3.2）×0.125=
=
×12=
÷
=
+
=
=
+
=
×
= 3÷
=
=
×
=
+
=
÷
=
÷12=
﹣
=
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