作业帮下面各题,怎样简便就怎样计算.（递等式）①18.9-18.9÷1.4+1.1 ②0.25×（4.8-7.5÷3）③2.3×1.5+4.5÷0.75 ④144÷0.6-4.2×3⑤18.5-（5.6+4.8）÷1.3 ⑥2.2×0.25+2.8×0.25⑦1.4×[（7.5+38.4）÷0.9] ⑧（2.5-2.5×0.6）÷0.4
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/05 14:04:00
![下面各题,怎样简便就怎样计算.（递等式）①18.9-18.9÷1.4+1.1 ②0.25×（4.8-7.5÷3）③2.3×1.5+4.5÷0.75 ④144÷0.6-4.2×3⑤18.5-（5.6+4.8）÷1.3 ⑥2.2×0.25+2.8×0.25⑦1.4×[（7.5+38.4）÷0.9] ⑧（2.5-2.5×0.6）÷0.4](/uploads/image/z/1841476-4-6.jpg?t=%E4%B8%8B%E9%9D%A2%E5%90%84%E9%A2%98%2C%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E5%B0%B1%E6%80%8E%E6%A0%B7%E8%AE%A1%E7%AE%97.%EF%BC%88%E9%80%92%E7%AD%89%E5%BC%8F%EF%BC%89%E2%91%A018.9-18.9%C3%B71.4%2B1.1+%E2%91%A10.25%C3%97%EF%BC%884.8-7.5%C3%B73%EF%BC%89%E2%91%A22.3%C3%971.5%2B4.5%C3%B70.75+%E2%91%A3144%C3%B70.6-4.2%C3%973%E2%91%A418.5-%EF%BC%885.6%2B4.8%EF%BC%89%C3%B71.3+%E2%91%A52.2%C3%970.25%2B2.8%C3%970.25%E2%91%A61.4%C3%97%5B%EF%BC%887.5%2B38.4%EF%BC%89%C3%B70.9%5D+%E2%91%A7%EF%BC%882.5-2.5%C3%970.6%EF%BC%89%C3%B70.4)
下面各题,怎样简便就怎样计算.（递等式）①18.9-18.9÷1.4+1.1 ②0.25×（4.8-7.5÷3）③2.3×1.5+4.5÷0.75 ④144÷0.6-4.2×3⑤18.5-（5.6+4.8）÷1.3 ⑥2.2×0.25+2.8×0.25⑦1.4×[（7.5+38.4）÷0.9] ⑧（2.5-2.5×0.6）÷0.4
下面各题,怎样简便就怎样计算.（递等式）
①18.9-18.9÷1.4+1.1 ②0.25×（4.8-7.5÷3）
③2.3×1.5+4.5÷0.75 ④144÷0.6-4.2×3
⑤18.5-（5.6+4.8）÷1.3 ⑥2.2×0.25+2.8×0.25
⑦1.4×[（7.5+38.4）÷0.9] ⑧（2.5-2.5×0.6）÷0.4
⑨[（8.1-5.6)×0.9]×0.4
下面各题,怎样简便就怎样计算.（递等式）①18.9-18.9÷1.4+1.1 ②0.25×（4.8-7.5÷3）③2.3×1.5+4.5÷0.75 ④144÷0.6-4.2×3⑤18.5-（5.6+4.8）÷1.3 ⑥2.2×0.25+2.8×0.25⑦1.4×[（7.5+38.4）÷0.9] ⑧（2.5-2.5×0.6）÷0.4
①=18.9×(1-1÷1.4)+1.1=5.4+1.1=6.5 ②=0.25×4.8-7.5×0.25÷3=1.2-0.625=0.575
③=2.3×1.5+1.5×3÷0.75=1.5×(2.3+3÷0.75)=9.45 ④=12×12÷0.6-4.2×3=12×20-4.2×3=227.4
⑤=18.5-10.4÷1.3=18.5-8=10.5 ⑥=0.25×(2.2+2.8)=5×0.25=1.25
⑦=1.4×(45.9÷0.9)=1.4×51=71.4 ⑧=[2.5×(1-0.6)]÷0.4=1÷0.4=2.5
⑨=[2.5×0.9]×0.4=2.5×0.4×0.9=1×0.9=0.9