ldcf.net
当前位置:首页 >> 用简便方法计算下面各题(1)7.8÷[32×(1X)+3.6... >>

用简便方法计算下面各题(1)7.8÷[32×(1X)+3.6...

(1)7.8÷[32×(1-58)+3.6]=7.8÷[32×38+3.6]=7.8÷[12+3.6]=7.8÷15.6=0.5;(2)20513-2.73-8.27+1713=(20513+1713)-(2.73+8.27)=22-11=11;(3)15×(115+117)×17=15×115×17+15×117×17=17+15=32;(4)4.3×1.8+86×0.91=43×0.18+43×2×0.91=43...

(10-7.5)×3.6 =2.5×3.6 =2.5×(4×0.9) =2.5×4×0.9 =10×0.9 =9

(1)32.5+3.6×2.5÷0.48,=32.5+9÷0.48,=32.5+18.75,=51.25;(2)22- 3 4 × 1 2 - 5 8 ,=22- 3 8 - 5 8 ,=22-( 3 8 + 5 8 ),=22-1,=21;(3)299÷(299+ 299 300 ),=299÷ 299×300+299 300 ,=299× 300 299×300+299 ,= 300 300+1 ,...

除法那部分先提取公因式 (8.1-5.4)÷3.6 = (0.9 x 9 - 0.9 x 6)÷ (0.9 x 4)= 0.9 x (9 - 6) ÷ (0.9 x 4)= 0.9 x (9 - 6) ÷ 0.9 ÷ 4= (9 - 6) ÷ 4= 0.75 (8.1-5.4)÷3.6+85.7= 0.75 + 85.7= 85 + 0.7 + 0.75= 85 + (0.7 + 0.75)= 85 + 1.45= ...

①2.5x2.8X4 乘法交换律+乘法结合律 =2.5x4x2.8 =10x2.8 =28 ②4.8X3.6一3.8X3.6 乘法分配律 =3.6x(4.8-3.8) =3.6x1 =3.6 ③(8十0.8)×1.25 乘法分配律 =8x1.25+0.8x1.25 =10+0.1 =10.1 ④7.09X99+7.09 乘法分配律 =7.09x(99+1) =7.09x100 =709

4.5x3.6+5.4x3.6 =(4.5+5.4)x3.6 =(10-1)x3.6 =10x3.6-3.6 =36-3.6 =32.4

因题目迷糊无法作答

(1)22.7×1.25×O.8,=22.7×(1.25×O.8),=22.7×1,=22.7;(2)3.91×2.8+6.09×2.8,=(3.91+6.09)×2.8,=10×2.8,=28;(3)9.83×(3.8-2.3)+1.5×6.17,=9.83×1.5+1.5×6.17,=(9.83+6.17)×1.5,=16×1.5,=24;(4)3.6×51+36×4.9,=3.6×51...

(1)8.54÷2.5÷0.4=8.54÷(2.5×0.4)=8.54÷1=8.54;(2)(9.37+9.37+9.37+9.37)×2.5=9.37×4×2.5=9.37×(4×2.5)=9.37×10=93.7;(3)3.6×10.1-0.36=3.6×10.1-3.6×0.1=3.6×(10.1-0.1)=3.6×10=36;(4)2.22×9.9+6.66×6.7=2.22×3×3.3+6.66×6.7...

3.6x1.9+3.6x8.1 =3.6×(1.9+8.1) =3.6×10 =36

网站首页 | 网站地图
All rights reserved Powered by www.ldcf.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com