简算 6.48-(2.48-1.52) 45.2-0.7-15.2-8.3 (7+41+74+414+744+4144)
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简算 6.48-(2.48-1.52) 45.2-0.7-15.2-8.3 (7+41+74+414+744+4144)×2.5
有些算式不能简算,就死算,不要全死算
有些算式不能简算,就死算,不要全死算
6.48-(2.48-1.52)
=6.48-2.48+1.52
=4+1.52
=5.52
45.2-0.7-15.2-8.3
=45.2-15.2-(0.7+8.3)
=30-9
=21
(7+41+74+414+744+4144)×2.5
=(48+488+4888)×2.5
=48×2.5+488×2.5+4888×2.5
=120+1220+12220
=13560
=6.48-2.48+1.52
=4+1.52
=5.52
45.2-0.7-15.2-8.3
=45.2-15.2-(0.7+8.3)
=30-9
=21
(7+41+74+414+744+4144)×2.5
=(48+488+4888)×2.5
=48×2.5+488×2.5+4888×2.5
=120+1220+12220
=13560
简算 6.48-(2.48-1.52) 45.2-0.7-15.2-8.3 (7+41+74+414+744+4144)
(7+41+74+414+744+4144)*2.5
(7+41+74+414+744+4144)*2.5怎么巧算?
简便计算:(7+41+74+414+744+4144)x2.5=急求
(6+43+473+5414+43444)*2.5 要简便 像这题一样:(7+41+74+414+744+41440*2
(7+41+744+4144+74444+414444)X2·5=
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