计算题巧算8.4x2.3+31x0.28 18.3x0.82+4.5x0.18-8.2x1.38

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计算题巧算8.4x2.3+31x0.2818.3x0.82+4.5x0.18-8.2x1.38计算题巧算8.4x2.3+31x0.2818.3x0.82+4.5x0.18-8.2x1.38计算题巧算8

计算题巧算8.4x2.3+31x0.28 18.3x0.82+4.5x0.18-8.2x1.38
计算题巧算
8.4x2.3+31x0.28 18.3x0.82+4.5x0.18-8.2x1.38

计算题巧算8.4x2.3+31x0.28 18.3x0.82+4.5x0.18-8.2x1.38
8.4x2.3+31x0.28
=0.28*30*2.3+31*0.28
=0.28*(69+31)
=0.28*100
=28
18.3x0.82+4.5x0.18-8.2x1.38
=8.2*(1.83-1.38)+4.5*0.18
=8.2*0.45+0.45*1.8
=0.45*(8.2+1.8)
=0.45*10
=4.5