有理数 计算 0.7×13/11-6.6×5/3-3.4÷5/3+0.7×11/9 注:如9/8 读作九分之八.

问题描述:

有理数 计算
0.7×13/11-6.6×5/3-3.4÷5/3+0.7×11/9 注:如9/8 读作九分之八.

0.7×13/11-6.6×5/3-3.4÷5/3+0.7×11/9
=0.7x(11/13+11/9)-5/3(6.6+3.4)
=0.7x11/22-5/3x10
=0.7x2-5/3x10
=1.4-6
=-4.6

原式=(0.7x11/13+0.7x11/9)-(6.6x5/3+3.4x5/3)
=0.7x(11/13+11/9)-5/3(6.6+3.4)
=0.7x11/22-5/3x10
=0.7x2-5/3x10
=1.4-6
=-4.6