8.35×0.58= 3.05×240= 10.3-7.89=
0.69×10=
7.6﹣5=
68.6+1.63=
10﹣4.1=
1﹣0.75=
11.8+8.2=
3.12×100=
1.2×0.5=
209×78
576×42
270×16
4.7-3.28
①11.6+2.87=
②645-1.09=
③3.2×5.4=
④7.05×4.6=
(a×3)×b=
(a×10)×(b×10)=
a×(b÷5)=
(a÷5)×(b×5)=