帮我做几道数学题(要简便运算)
问题描述:
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
答
*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=333002.45.6*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....