计算题 5﹣x=3 2:5=0.75:x 614115﹣517440÷168 (3.3×6.3×0.6)÷(1.8+2.7×1.9) 18﹣2÷(3+1)×20 2.74﹣0.56×(2﹣1+2.275)
8-2= 6+2= 8-6=
6-3= 3+3= 7-5= 5+2=
9-4= 9-5= 4+5=
10-4= 10-6= 4+6=
5+2= 7-5= 7-2=