帮我做几道数学题（要简便运算） 33.3乘334+99.9乘222 45.6乘6.7+4.56乘31+0.456乘2015.8乘5.8+4.2乘4.2+11.6乘4.2 （0.05+0.05+0.05）乘9+0.05乘73

帮我做几道数学题（要简便运算） 33.3乘334+99.9乘222 45.6乘6.7+4.56乘31+0.456乘2015.8乘5.8+4.2乘4.2+11.6乘4.2 （0.05+0.05+0.05）乘9+0.05乘73
帮我做几道数学题（要简便运算）
33.3乘334+99.9乘222 45.6乘6.7+4.56乘31+0.456乘20
15.8乘5.8+4.2乘4.2+11.6乘4.2
（0.05+0.05+0.05）乘9+0.05乘73

帮我做几道数学题（要简便运算） 33.3乘334+99.9乘222 45.6乘6.7+4.56乘31+0.456乘2015.8乘5.8+4.2乘4.2+11.6乘4.2 （0.05+0.05+0.05）乘9+0.05乘73
*是乘的意思.
1.33.3*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
2.45.6*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
3.15.8*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.(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

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
=33.3*334+33.3*666
=33.3*(334+666)
=33.3*1000
=33300
45.6*6.7+45.6*3.1+45.6*0.2
=45.6*(6.7+3.1+0.2)
=45.6*10
=456
(0.05+0.05+0.05)*9+0.05*73

全部展开

33.3*334+33.3*3*222
=33.3*334+33.3*666
=33.3*(334+666)
=33.3*1000
=33300
45.6*6.7+45.6*3.1+45.6*0.2
=45.6*(6.7+3.1+0.2)
=45.6*10
=456
(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
15.8*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

收起

1.原式=33.3*（334+3*222）=33.3*1000=33300
2.原式=4.56*（67+31+2）=456
3.原式=15.8*（10-4.2）+4.2*4.2+11.6*4.2
=158-15.8*4.2+4.2*4.2+11.6*4.2
=158-[4.2*（15.8-4.2-11.6）]=158
4.原式=3*0.05*9+0.05*73
=0.05*（27+73）=5

1.33.3*334+99.9*222
=33.3*(334+666)
=33.3*1000
=33300
2.45.6*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
3.15.8*5.8+4.2*4.2+11.6*4.2
...

全部展开

1.33.3*334+99.9*222
=33.3*(334+666)
=33.3*1000
=33300
2.45.6*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
3.15.8*5.8+4.2*4.2+11.6*4.2
=15.8*5.8+4.2*15.8
=15.8*(5.8+4.2)
=15.8*10
=158
4.(0.05+0.05+0.05)*9+0.05*73
=0.05*27+0.05*73
=0.05*（27+73）
=0.05*100
=5

收起

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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