李娟同学买了2支圆珠笔与3本练习本,共付7.2元,每支圆珠笔X元,每本练习本Y元. =7.2.
能简算则简算12.45﹣9.62+0.37 0.83+0.9+0.1+0.17 6.32﹣(5.26﹣3.68)35×8+35×11+35 32×125×25 (135+415)÷5﹣16.
计算下面各题,能简算的要简算.8.27+5.84+1.73+2.16. 18.51﹣9.08﹣0.92 528÷6×5﹣432282×5+18×5 75+360÷20+15 (641﹣341)÷25×4.
计算,能简算的要简算.2.144÷3.2+4.32 9.66÷2.3÷0.3 5.5×0.25×1.41.25×2.47×8 27×10.2 4.8×3.8+6.2×4.8
怎样简便就怎样算.4.27÷0.7×1.3 18.9﹣18.9÷1.4 0.25×4080.25×1.25×16 0.4×99+0.4 12.5×1.7+8.3×12.5.
简便计算12.8﹣0.5×0.5﹣0.75 1.25×3.2×0.8 8.37×1.4+8.6×8.37.