51-6= 68-8= 50+30= 5+28=
4×5= 6×3= 3×9= 5×6=
45+14+23= 98-(70-5)=
①37+27+16=
②17+19+59=
③76-35-23=
④77-36+4=
⑤46-24+55=
⑥35+18-26=
74-22=
7×5=
47+12=
65+18=
6×7=
9×3=
8+8=
59-17=
58-28+31=
4×3+51=
4×8-22=
9×4-14=
8×3+8= 5×6+5= 5×7+5=
8×5-8= 5×8-5= 5×9-5=
8×4= 5×7= 5×8=
3×36 20-44×4 44+2030+51 35+950-8
49.7、14亿、、20%、﹣155
9.4-3.2= 2×10%= + = 0.32= 3.14×8=
÷2= 8:13= 1- = × = 870÷29=