计算 2.2+4.4+6.6+8.8+11+13.2÷1.1+2.2+3.3+4.4+5.5+6.6 (写出过程)

问题描述:

计算 2.2+4.4+6.6+8.8+11+13.2÷1.1+2.2+3.3+4.4+5.5+6.6 (写出过程)
要简便

原式应该是(2.2+4.4+6.6+8.8+11+13.2)÷(1.1+2.2+3.3+4.4+5.5+6.6 )
=(2X1.1+2X2.2+2X3.3+2X4.4+2X5.5+2X6.6)÷(1.1+2.2+3.3+4.4+5.5+6.6 )=2X(1.1+2.2+3.3+4.4+5.5+6.6)÷(1.1+2.2+3.3+4.4+5.5+6.6 )
=2