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8.25×3.8+7.2×4×8.5-8
=(8+0.25)×3.8+7.2×4×8.5-8
=8×3.8+0.25×(4-0.2)-8+7.2×(4×8.5)
=8×(3.8-1)+1-0.05+(7+0.2)×34
=8×2.8+0.95+7×34+6.8
=8×(3-0.2)+0.95+6.8+7×(30+4)
=24-1.6+0.95+6.8+210+28
=210+28+24+6.8-1.6+0.95
=262+6.15
=268.15
=(8+0.25)×3.8+7.2×4×8.5-8
=8×3.8+0.25×(4-0.2)-8+7.2×(4×8.5)
=8×(3.8-1)+1-0.05+(7+0.2)×34
=8×2.8+0.95+7×34+6.8
=8×(3-0.2)+0.95+6.8+7×(30+4)
=24-1.6+0.95+6.8+210+28
=210+28+24+6.8-1.6+0.95
=262+6.15
=268.15
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2018-01-19 · 知道合伙人教育行家
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展开全部
8.25×3.8+7.2×4×8.5-8
=8.25×(4-0.2)+7.2×(4×8.5)-8
=8.25×4-8.25×0.2+7.2×34-8
=33-1.65+(7+0.2)×34-8
=25-1.65+34×7+34×0.2
=25+238+6.8-1.65
=263+5.15
=268.15
=8.25×(4-0.2)+7.2×(4×8.5)-8
=8.25×4-8.25×0.2+7.2×34-8
=33-1.65+(7+0.2)×34-8
=25-1.65+34×7+34×0.2
=25+238+6.8-1.65
=263+5.15
=268.15
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