简便方法:①5.2-3.65+4.8-5.35 ②(1.6+4.2/0.3)*0.5 ③0.75*99-4分之3+2*75% 速度点…………急…………
问题描述:
简便方法:①5.2-3.65+4.8-5.35 ②(1.6+4.2/0.3)*0.5 ③0.75*99-4分之3+2*75% 速度点…………急…………
答
①5.2-3.65+4.8-5.35
=5.2+4.8-(3.65+5.35)
=10-9
=1
②(1.6+4.2/0.3)*0.5
=(1.6+1.4)*0.5
=3*0.5
=1.5
③0.75*99-4分之3+2*75%
=0.75*(99-1+2)
=0.75*100
=75