几道简便方法列竖式15x888+32x0.125x0.2519.98x37-199.8x1.9+1998x0.8225+30+35+40…+195+200

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几道简便方法列竖式15x888+32x0.125x0.2519.98x37-199.8x1.9+1998x0.8225+30+35+40…+195+200几道简便方法列竖式15x888+32x0.12

几道简便方法列竖式15x888+32x0.125x0.2519.98x37-199.8x1.9+1998x0.8225+30+35+40…+195+200
几道简便方法列竖式
15x888+32x0.125x0.25
19.98x37-199.8x1.9+1998x0.82
25+30+35+40…+195+200

几道简便方法列竖式15x888+32x0.125x0.2519.98x37-199.8x1.9+1998x0.8225+30+35+40…+195+200
15x888+32x0.125x0.25
=15×8×111+4×8×0.125×0.25
=120×(100+10+1)+(1×1)
=12000+1200+120+1
=13321
19.98x37-199.8x1.9+1998x0.82
=19.98×37-19.98×19+19.98×82
=19.98×(37-19+82)
=19.98×100
=1998
25+30+35+40…+195+200
=(25+200)×36÷2
=225×36÷2
=4050