25+43+19=
80﹣19﹣32=
50﹣32+29=
算式:( )×( )=( )
口诀:
5+42=
44+26=
38-26=
65-38=
81-6-30=
68+20-44=
3×4=
7×9=
4×8=
5×9+9=
6×3-8=
71-(56-22)=
3+33×3 16+2349+2-31 4×42×5
4×53×5 27-1589-75 9×445
4321+500= 13.2-5.2= × = 0.2×1.4=
8÷25%= + = 2.4÷ = ÷ =