来自拾华杰的问题
用递等式计算20.9+10.5÷(5-3.5);9.4×[1.28-(1.54-0.31)].
用递等式计算
20.9+10.5÷(5-3.5); 9.4×[1.28-(1.54-0.31)].
1回答
2020-04-18 14:57
用递等式计算20.9+10.5÷(5-3.5);9.4×[1.28-(1.54-0.31)].
用递等式计算
20.9+10.5÷(5-3.5); 9.4×[1.28-(1.54-0.31)].
20.9+10.5÷(5-3.5)
=20.9+10.5÷1.5
=20.9+7
=27.9
9.4×[1.28-(1.54-0.31)]
=9.4×[1.28-1.23]
=9.4×0.05
=0.47.