第9题，一定采纳
1个回答
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2.02×8.5
=（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
1.6×7.5×1.25
=（7.5×2）×（1.25×0.8）
=15×1
=15
56×1.25
=8×7×1.25
=（8×1.25）×7
=10×7
=70
3.4×7×1.5
=2×1.7×7×1.5
=（2×1.5）×7×1.7
=3×7×1.7
=35.7
0.8×0.25×0.4×12.5
=（0.8×12.5）×（0.25×0.4）
=10×0.1
=1
=（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
1.6×7.5×1.25
=（7.5×2）×（1.25×0.8）
=15×1
=15
56×1.25
=8×7×1.25
=（8×1.25）×7
=10×7
=70
3.4×7×1.5
=2×1.7×7×1.5
=（2×1.5）×7×1.7
=3×7×1.7
=35.7
0.8×0.25×0.4×12.5
=（0.8×12.5）×（0.25×0.4）
=10×0.1
=1
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