简算,7.5x2.9+0.75 28.5x1.3-85x0.13

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简算,7.5x2.9+0.75 28.5x1.3-85x0.13
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简算,7.5x2.9+0.75 28.5x1.3-85x0.13
简算,
7.5x2.9+0.75 28.5x1.3-85x0.13

简算,7.5x2.9+0.75 28.5x1.3-85x0.13
1.原式=7.5x2.9+7.5x0.1=7.5x(2.9+0.1)=22.5
2原式=28.5x1.3-8.5x1.3=(28.5-8.5)x1.3=26

(1) 0.75 x 29 + 0.75 =0.75 x (29+1) =0.75 x 30 =22.5
(2) 28.5 x 1.3 - 8.5 x 1.3 =(28.5 -8.5) x 1.3 = 20 x 1.3 =26

7.5x2.9+0.75=0.75*29+0.75*1=0.75*30=22.5
28.5x1.3-85x0.13=28.5*1.3-8.5*1.3=20*1.3=26