28乘以(2.25+29.5除以1.5)用最简便的方式应该怎样计算?
2个回答
2013-10-17
展开全部
原式=2.8x2.25+2.8x29.5/1.5
=(2+0.8)(2+0.25)+2.8x59/3
=4+0.5+1.6+0.2+28x59/30
=6.3+14x59/15
=6.3+826/15
≈6.3+55.07
≈61.37
望采纳,谢谢!
=(2+0.8)(2+0.25)+2.8x59/3
=4+0.5+1.6+0.2+28x59/30
=6.3+14x59/15
=6.3+826/15
≈6.3+55.07
≈61.37
望采纳,谢谢!
2013-10-17
展开全部
28×(2.25+29.5/1.5)
=4×7×[2.25+(30-0.5)/1.5]
=7×[2.25×4+4×(30/1.5-0.5/1.5)]
=7×[9+4×(20-0.5/1.5)]
=63+7×80-7×2/1.5
=623-14/1.5
=623-9.33
=613.67
=4×7×[2.25+(30-0.5)/1.5]
=7×[2.25×4+4×(30/1.5-0.5/1.5)]
=7×[9+4×(20-0.5/1.5)]
=63+7×80-7×2/1.5
=623-14/1.5
=623-9.33
=613.67
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