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用简便计算。2.02x8.51.25+4.6+0.751.6x7.5x1.25用简便计算。2.02x8.51.25+4.6+0.751.6x7.5x1.2556x1.253.4x7x1.50.8x0.25x0.4x12.5

题目详情
用简便计算。2.02x8.5 1.25+4.6+0.75 1.6x7.5x1.25
用简便计算。2.02x8.5 1.25+4.6+0.75 1.6x7.5x1.25 56x1.25 3.4x7x1.5 0.8x0.25x0.4x12.5
▼优质解答
答案和解析
2.02x8.5
=(2+0.02)*8.5
=2*8.5+0.02*8.5
=17+0.17
=17.17
1.25+4.6+0.75
=(1.25+0.75)+4.6
=2+4.6
=6.6
1.6x7.5x1.25
=0.8*2*7.5*1.25
=(0.8*1.25)*(2*7.5)
=1*15
=15
56x1.25
=7*(8*1.25)
=7*10
=70
3.4x7x1.5
= 3.4*(7*1.5)
= 3.4*10.5
=3.4*(10+0.5)
=3.4*10+3.4*0.5
=34+1.7
=35.7
0.8x0.25x0.4x12.5
=(0.8*12.5)*(0.25*0.4)
=10*0.1
=1