Question

20.2x4.6+220x0.46+5.78简便方法?

Answer 1

20.2×4.6＋220×0.46＋5.78
=20.2×4.6＋22×4.6＋5.78
=4.6×(20.2＋22)＋5.78
=4.6×42.2＋5.78
=194.12＋5.78
=199.9

Answer 2

＝20.2*4.6+220*0.46+5.78
＝20.2*4.6+22*4.6+5.78
＝4.6*（20.2+22）+5.78
＝4.6*42.2+5.78
＝ 199.9

Answer 3

20.2x4.6+220x0.46十5.78
二92.92十220x0.46十5.78
二92.92十101.2+5.78
二194.12+5.78
二199.9

Answer 4

原式＝20.2x4.6+22x4.6+5.78
＝4.6x（20.2+22）+5.78
＝4.6x42.2+5.78
＝4.6x（50-7.8）+5.78
＝4.6x50-4.6x7.8+5.78
＝230-4.6x（10-2.2）+5.78
＝230-46+4.6x2.2+5.78
＝184+4.6x（2+0.2）+5.78
＝184+4.6x2+4.6x0.2+5.78
＝184+9.2+0.92+5.78
＝184+9.2+6.7
＝184+15.9
＝199.9