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-1/3*2/3-0.34*2/7+1/3*(-13)-5/7*0.34运用乘法运算律计算

题目详情
-1/3*2/3-0.34*2/7+1/3*(-13)-5/7*0.34
运用乘法运算律计算
▼优质解答
答案和解析
1/3*2/3-0.34*2/7+1/3*(-1/3)-5/7*0.34?,题目中1/3*(-13)是1/3*(-1/3)吗?
=[1/3*2/3+1/3*(-1/3)]+[-0.34*2/7-5/7*0.34]
=[(1/3)*(2/3-1/3)]+[0.34*(-2/7-5/7)]
=[(1/3)*(1/3)]+[0.34*(-1)]
=(1/9)-0.34
=1/9-17/50
=50/450-17*9/450
=(50-153)/450
=103/450