Question

2.2*9.9 3.3*3.4简便方法计算

Answer 1

2.2*9.9+3.3*3.4
=2.2*3*3.3+3.3*3.4
=6.6*3.3+3.3*3.4
=（6.6+3.4）*3.3
=10*3.3
=33

Answer 2

2.2×9.9
=2.2×（10-0.1）
=2.2×10-2.2×0.1
=22-0.22
=21.78
3.3×3.4
=3.4×（3+0.3）
=3.4×3+3.4×0.3
=10.2+1.02
=11.22