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1.6*7.5*1.250.23*1.49.9*3.6(四年级简便计算)急!

题目详情
1.6*7.5*1.25 0.23*1.4 9.9*3.6(四年级简便计算)急!
▼优质解答
答案和解析
1.6*7.5*1.25 =2*0.8*7.5*1.25
=(2*7.5)*(0.8*1.25)
=15*1
=15
0.23*1.4
=(0.2+0.03)*1.4
=0.2*1.4+0.03*1.4
=0.28+0.042
=0.322
9.9*3.6
=(10-0.1)*3.6
=10*3.6-0.1*3.6
=36-0.36
=35.64