9.9×1.2+0.12简便运算
问题描述：
9.9×1.2+0.12简便运算
答
9.9×1.2+0.12
=9.9×1.2+1.2×0.1
=1.2×（9.9+0.1）
=1.2×10
=127.8÷0.25+2.2×4能简便蛮？43.2-1.8÷3-4.6能简便蛮？8.04÷0.3-8.04×0.3能简便蛮？7.8÷0.25+2.2×4=7.8×4+2.2×4=4×（7.8+2.2）=4×10=4043.2-1.8÷3-4.6=43.2-0.6-4.6=43.2-(0.6+4.6)=43.2-5.2=388.04÷0.3-8.04×0.3=8.04×10/3-8.04×0.3=80.4÷3-8.04×0.3=26.8-2.412=24.388