怎样简便就怎样算
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2.02x8.5
=(2+0.02)x8.5
=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
=0.2x(8x1.25)x7.5
=0.2x10x7.5
=2x7.5
=15
56x1.25
=7x(8x1.25)
=7x10
=70
3.4x7x1.5
=(17/5)x7x(3/2)
=17x(20+1)/10
=(340+17)/10
=357/10
=35.7
0.8x0.25x0.4x12
=(0.8x0.25)x(0.4x12)
=0.2x4.8
=0.96
=(2+0.02)x8.5
=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
=0.2x(8x1.25)x7.5
=0.2x10x7.5
=2x7.5
=15
56x1.25
=7x(8x1.25)
=7x10
=70
3.4x7x1.5
=(17/5)x7x(3/2)
=17x(20+1)/10
=(340+17)/10
=357/10
=35.7
0.8x0.25x0.4x12
=(0.8x0.25)x(0.4x12)
=0.2x4.8
=0.96
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（2+0.02）*8.5=2*8.5+0.02*8.5=17.17
1.25+0.75+4.6=2+4.6=6.6
1.25+0.75+4.6=2+4.6=6.6
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