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脱式计算.2.5+(6.2-2.6)+1.8119-(42.5+1.6+3.6)7.24+(3.1-3.09)[0.15+(2.4-1.8)]×200.78×[12-(1.45+3.8)]9.07-22.78÷3.4.

题目详情
脱式计算.
2.5+(6.2-2.6)+1.8
119-(42.5+1.6+3.6)
7.24+(3.1-3.09)
[0.15+(2.4-1.8)]×20
0.78×[12-(1.45+3.8)]
9.07-22.78÷3.4.
▼优质解答
答案和解析
①2.5+(6.2-2.6)+1.8
=2.5+3.6+1.8
7.9;

②119-(42.5+1.6+3.6)
119-47.7
=71.3;

③7.24+(3.1-3.09)
=7.24+0.01
=7.25;

④[0.15+(2.4-1.8)]×20
=[0.15+0.6]×20
=0.75×20
=15;

⑤0.78×[12-(1.45+3.8)]
=0.78×[12-5.25]
=0.78×6.75
=5.265;

⑥9.07-22.78÷3.4
=9.07-6.7
=2.37.