(2.5×8.8+2.5×0.8)×1.25 巧算

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(2.5×8.8+2.5×0.8)×1.25 巧算
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(2.5×8.8+2.5×0.8)×1.25 巧算
(2.5×8.8+2.5×0.8)×1.25 巧算

(2.5×8.8+2.5×0.8)×1.25 巧算
(2.5×8.8+2.5×0.8)×1.25
=2.5×(1.1+0.1)×0.8×1.25
=2.5×12×1
=2.5×2×6
=5×6
=30

2.5x9.6x1.25
=8x1.25x2.5x0.4x3
=10x1x3=30

(2.5×8.8+2.5×0.8)×1.25
=(2.5*0.8*11+2.5*0.8)*1.25
=2.5*0.8*12*1.25
=2.5*12*0.8*1.25
=2.5*12
=2.5*4*3
=10*3
=30

(2.5×8.8+2.5×0.8)×1.25
=(2.5×4×2.2+2.5×4×0.2)×1.25
=(10×2.2+10×0.2)×1.25
=(22+2)×1.25
=24×1.25
=8×1.25×3
=10×3
=30