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用自己喜欢的方法计算2.5×10.80.46÷8+0.77÷40.076×990.125×63×0.8.

题目详情
用自己喜欢的方法计算
2.5×10.8                         
0.46÷8+0.77÷4
0.076×99                       
 0.125×63×0.8.
▼优质解答
答案和解析
(1)2.5×10.8
=2.5×(10+0.8)
=2.5×10+25×0.8
=25+20
=45

(2)0.46÷8+0.77÷4
=(0.46÷2)÷(8÷2)+0.77÷4
=0.23÷4+0.77÷4
=(0.23+0.77)÷4
=1÷4
=0.25

(3)0.076×99 
=0.076×(100-1)
=0.076×100-0.076
=7.6-0.076
=7.524

(4)0.125×63×0.8
=0.125×0.8×63
=0.1×63
=6.3