2.2×0.36+0.783×.6 递等式

题目

2.2×0.36+0.783×.6 递等式
搞错了,是2.2×0.36+0.78×3.6

答案

2.2×0.36+0.78×3.6
=2.2*3.6+7.8*3.6
=（2.2+7.8）*3.6
=10*3.6
=36
扩大缩小后再用提公因式法...