0.7×11分之3-6.6×7分之3-2.2÷3分之7+0.7×11分之19

问题描述:

0.7×11分之3-6.6×7分之3-2.2÷3分之7+0.7×11分之19

.7×11分之3-6.6×7分之3-2.2÷3分之7+0.7×11分之19
=0.7×11分之3-6.6×7分之3-2.2×7分之3+0.7×11分之19
=0.7×(3/11+19/11)-(6.6+2.2)×3/7
=0.7×2-8.8×3/7
=1.4-3又27/35
=-2又13/35