(20+8+12)ⅹ25简便方法?
3个回答
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(20+8+12)×25
=(4×5+4×2+4×3)×25
=(5+2+3)×4×25
=10×100
=1000
=(4×5+4×2+4×3)×25
=(5+2+3)×4×25
=10×100
=1000
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展开全部
(20+8+12)x25
=(4x5+4x2+4x3)x25
=4x25x5+4x25x2+4x25x3
=100x5+100x2+100x3
=500+200+300
=1000
=(4x5+4x2+4x3)x25
=4x25x5+4x25x2+4x25x3
=100x5+100x2+100x3
=500+200+300
=1000
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