Question

用简便方法计算。0·46x1·9＋0·54x1·9

Answer 1

3.45 * 102
=3.45 * 【100+2】
=3.45 * 100 + 3.14 * 2
=345 + 6.9
=351.9
0.47 * 0.5 * 0.8
=0.47 * 【0.5 * 0.8】
=0.47 *0.4
=0.188
0.46*1.9+0.54*1.9
=【0.46+0.54】 * 1.9
=1 * 1.9
=1.9

Answer 2

3.45*102=3.45*（100+2）=345+6.9=351.9

0.47*0.5*0.8=（0.5-0.03）*（0.5*0.8）=0.5*0.4-0.03*0.4=0.2-0.012=0.188

0.46*1.9+0.54*1.9=（0.46+0.54）*1.9=1*1.9=1.9

Answer 3

Answer 4

1.9×（0.46+0.54）
=1.9×1
=1.9

3·45x102
=3·45x(100+2)
=3·45x100+3·45x2
=345+6·9
=351·9

0·47x0·5x0·8
=0·47x(0·5x0·8)
=0·47x0·4
=0·188

Answer 5

(0.46+0.54)x1.9=1.9

追答

想知道下面的问题就回声，否则我不知道你在不在