帮我做几道数学题（要简便运算）

*是乘的意思。

1.解：33.3*334+99.9*222
=33.3*334+33.3*3*222
=33.3*334+33.3*666
=33.3*(334+666)
=33.3*1000
=33300

2.解：45.6*6.7+4.56*31+0.456*20
=45.6*6.7+45.6*3.1+45.6*0.2
=45.6*(6.7+3.1+0.2)
=456

3.解：15.8*5.8+4.2*4.2+11.6*4.2
=15.8*5.8+4.2*（4.2+11.6）
=15.8*5.8+4.2*15.8
=15.8*(5.8+4.2)
=15.8*10
=158

4.解：(0.05+0.05+0.05)*9+0.05*73
=0.05*3*9+0.05*73
=0.05*27+0.05*73
=0.05*（27+73）
=0.05*100
=5

15.8x5.8+4.2x4.2+11.6x4.2
=4.2+5.8=10 x 4.2+15.8=20
=11.6x4.2=48.72x200=248.72

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1: 33.3*334+99.9*222=33.3*334+33.3*3*222=33.3(334+666)=33.3*1000=33300
2: 45.6*6.7+4.56*31+0.456*20=4.56*67+4.56*31+4.56*2=4.56(67+31+2)=4.56*100=456
3: 15.8*5.8+4.2*4.2+11.6*4.2=15.8*5.8+4.2(11.6+4.2)=15.8*5.8+15.8*4.2=15.8(5.8+4.2)=15.8*10=158
4: (0.05+0.05+0.05)*9+0.05*73=0.05*3*9+0.05*73=0.05*(27+73)=0.05*100=5

33.3*334+33.3*3*222