2十4十6十8十…18十20=多少 用简便方法算

相关推荐

• 29.5*3.8+2.95*52+295*1/10怎么简便计算
• 6.9÷2.3= 12 ＋13 = 9＋29 = 45 ＋12 =112 ＋14 = 3.5＋612 = 2―67 = 45 ―815 =14 ―15 = 12 ―25 = 0.2―16 = 0.3＋13 =34 ×4= 56 ×815 = 316 ×49 = 15×123 =724 ×34 = 0÷35 = 24÷34 = 25 ÷12 =518 ÷123 = 89 ÷38 = 58 ÷23 = 10＋10%=80%×14 = 1÷25%= 10÷10%= 98＋52＋48=2.8―0.16―0.48= 0.9×99＋0.9= 3－3÷5= 1.6＋0.4×10= 15×0.4×4= (0.18＋0.9)÷9= 100－2.5－7.5= 10.75－(0.75＋3.4)=35 －512 ＋712 = 57 ＋17 ＋97 = 34 ＋12 ÷12 =(3＋320 )×5= 0.13＋38 ＋0.87=(1.125－18 )÷0.75= 3.25＋1021 ＋34 = 15 ×12÷15 = 0.