98×37 简便运算还有10+11+12+13+14+15+16+17+18+19+20=?

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 17:22:44

98×37 简便运算还有10+11+12+13+14+15+16+17+18+19+20=?
98×37 简便运算
还有10+11+12+13+14+15+16+17+18+19+20=?

98×37 简便运算还有10+11+12+13+14+15+16+17+18+19+20=?
98×37=(100-2)*37
=3700-74
=3626
10+11+12+13+14+15+16+17+18+19+20
=(10+20)+(11+19)+.(14+16)+15
=30*5+15
=165

98×37
=(100-2)×37
=100×37-2×37
=3700-74
=3626
10+11+12+13+14+15+16+17+18+19+20
=(10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+30+15
=150+15
=165

98x37=(100-2)x37=100x37-2x37=3700-74=3626
10+11+12+13+14+15+16+17+18+19+20=30x5+15=165