用简便计算计算下列脱式:37.2×5.4+3.28×54=0.8888×0.8+0.1111×1.6=9.99×7.78
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3个回答

37.2×5.4+3.28×54

=37.2×5.4+3.28×10×5.4

=37.2×5.4+32.8×5.4

=(37.2+32.8)×5.4

=70×5.4

=7×54

=378

0.8888×0.8+0.1111×1.6

=0.1111×8×0.8+0.1111×1.6

=0.1111×6.4+0.1111×1.6

=0.1111×(6.4+1.6)

=0.1111×8

=0.8888

9.99×7.78+3.33×6.66

=9.99×7.78+3.33×3×2.22

=9.99×7.78+9.99×2.22

=9.99×(7.78+2.22)

=9.99×10

=99.9

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