3.54*9.9+3.54*0.1 2.9*0.45+0.29*4.2+0.029*13 6.4*99 9.58*0.8
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/10/05 21:52:35
3.54*9.9+3.54*0.1 2.9*0.45+0.29*4.2+0.029*13 6.4*99 9.58*0.8*1.25 101*0.68简算
快急
快急
3.54 x 9.9 +3.54 x 0.1 = 3.54 x ( 9.9 + 0.1 ) = 3.54 x 10 = 35.4
2.9 x 0.45 + 0.29 x 4.2 + 0.029 * 13 = 0.29 x 10 x 0.45 +0.29 x 4.2 + 0.29 x 0.1 x 13
=0.29 x ( 4.5 + 4.2 +1.3 ) = 0.29 x 10 = 2.9
6.4 x 99.9 = 6.4 x ( 100 - 0.1 ) = 6.4 x 100 - 6.4 x 0.1 = 640 - 0.64 = 639.36
9.58 x 0.8 x 1.25 =9.58 x ( 0.8 x 1.25 ) = 9.58 x 1 =9.58
101 x 0.68 = ( 100 + 1) x 0.68 = 100 x 0.68 + 1 x 0.68 = 68 + 0.68 =68.68
2.9 x 0.45 + 0.29 x 4.2 + 0.029 * 13 = 0.29 x 10 x 0.45 +0.29 x 4.2 + 0.29 x 0.1 x 13
=0.29 x ( 4.5 + 4.2 +1.3 ) = 0.29 x 10 = 2.9
6.4 x 99.9 = 6.4 x ( 100 - 0.1 ) = 6.4 x 100 - 6.4 x 0.1 = 640 - 0.64 = 639.36
9.58 x 0.8 x 1.25 =9.58 x ( 0.8 x 1.25 ) = 9.58 x 1 =9.58
101 x 0.68 = ( 100 + 1) x 0.68 = 100 x 0.68 + 1 x 0.68 = 68 + 0.68 =68.68
3.54*9.9+3.54*0.1 2.9*0.45+0.29*4.2+0.029*13 6.4*99 9.58*0.8
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2.9×0.45+0.29×4.2+0.029×13 3.84×9.6+0.96×61.6 0