简便计算:1.25×8.8 1.25×5.7+5/4×4.3 8.3×2.5+75×0.38
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/17 01:40:43
简便计算:1.25×8.8 1.25×5.7+5/4×4.3 8.3×2.5+75×0.38
![简便计算:1.25×8.8 1.25×5.7+5/4×4.3 8.3×2.5+75×0.38](/uploads/image/z/1140157-37-7.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%3A1.25%C3%978.8+1.25%C3%975.7%2B5%2F4%C3%974.3+8.3%C3%972.5%2B75%C3%970.38)
1、1.25×8.8=1.25×8×1.1=11
2、1.25×5.7+5/4×4.3=1.25×5.7+1.25×4.3=1.25×(5.7+4.3)=1.25×10=12.5
3、8.3×2.5+75×0.38=(4×2+0.3)×2.5+75×0.38=20+0.3×2.5+0.75×38=20+0.25×3×(40-1)
=20+3×(10-0.25)=20+30-0.75=49.25
2、1.25×5.7+5/4×4.3=1.25×5.7+1.25×4.3=1.25×(5.7+4.3)=1.25×10=12.5
3、8.3×2.5+75×0.38=(4×2+0.3)×2.5+75×0.38=20+0.3×2.5+0.75×38=20+0.25×3×(40-1)
=20+3×(10-0.25)=20+30-0.75=49.25