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78.5X0.81+7.85x1.9的脱式计算

78.5X0.81+7.85x1.9 =63.585+14.915 =78.5

4/5x4+2/5x2+1/5x16 =16/5+4/5+16/5 =36/5 =7.2

=0.2乘1=0.2

2.5x45x0.4 =2.5x0.4x45 =1x45 =45

参差荇菜,左右采之.窈窕淑女,琴瑟友之.

12.5X(8+0.8) =12.5×8+12.5×0.8 =100+10 =110

12.5x0.4x0.25x0.8用脱式计算 =(12.5x0.8)x(0.4x0.25) =10x0.1 =1

29+ 5x105 +29脱式计算 =29*2+5*(100+5) =58+500+25 =500+58+25 =500+83 =583

23.5+76.5x0.25+0.75 =23.5x(0.25+0.75)+76.5x0.25+0.75 =23.7x0.25+23.5x0.75+76.5x0.25+0.75 =23.7x0.25+76.5x0.25+0.75+23.5x0.75 =(23.7+76.5)x0.25+0.75x(1+23.5) =100x0.25+0.75x24.5 =25+3/4x24.5 =25+18.375 =43.375 谢谢,请采纳

5x加上四分之1=4分之九用脱式计算 5x加上四分之1=4分之九 5x=9/4-1/4 5x=8/4 5x=2 x=2/5

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