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用简便方法计算.256+982000-586-11455×25+25×45(40+4)×25.

题目详情
用简便方法计算.
256+98
2000-586-114
55×25+25×45
(40+4)×25.
▼优质解答
答案和解析
(1)256+98
=256+(100-2)
=(256+100)-2
=356-2
=354;

(2)2000-586-114
=2000-(586+114)
=2000-700
=1300;

(3)55×25+25×45
=(55+45)×25
=100×25
=2500;

(4)(40+4)×25
=40×25+4×25
=1000+100
=1100.