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1.8×6.5 4.2×1.5的简便计算

(a+b)+ c = a +(b+c) 1. 2.73 + 0.89 + 1.27 2. 4.37 + 0.28 + 1.63 + 5.72 a-b-c = a -(b+c) 1. 10 - 0.432 - 2.568 2. 9.3 - 5.26 - 2.74 3. 13.4-(3.4+5.2) 4. 14.9-(5.2+4.9) 5. 18.32 - 5.47 - 4....

6.5×6+1.5×4 =6.5x6+6 =6x(6.5+1) =3x2x7.5 =3x15 =45

0.8X6.5X4.2 =5.2X4.2 =5.2X4+5.2X0.2 =20.8+1.04 =21.84

7.8-1.8×5/6 =7.8-1.8/6×5 =7.8-0.3×5 =7.8-1.5 =6.3

2.5x0.6-1.8x0.5 =0.5×5×0.6-0.3×6×0.5 =0.5×3-0.3×3 =0.2×3 =0.6

2.6×0.6-1.8×0.5 =0.6x(2.6-0.5x3) =0.6x(2.6-1.5) =0.6x(1+0.1) =0.6+0.06 =0.66

解; (2.82+1.8)×6.5 =(2.82+0.18+1.8+0.2)×6.5-(0.18+0.2)×6.5 =5×6.5-0.38×6.5 =32.5-2.47 =30.03

2.5×0.6-1.8×0.5的简便算法 =0.5x(5x0.6)-1.8x0.5 =0.5x3-1.8x0.5 =0.5x(3-1.8) =0.5x1.2 =0.6

(1)1.5÷1.8+1.3×0.6,= 5 6 +0.78,= 1 46 75 ;(2)25×1.25×32,=25×1.25×8×4,=(25×4)×(1.25×8),=100×10,=1000;(3)( 4 5 + 1 4 )÷ 7 3 + 7 10 ,= 21 20 ÷ 7 3 + 7 10 ,= 9 20 + 7 10 ,=1.15;(4)56×( 4 7 + 5 8 - 3 4 )...

简便计算 1.2×6.5 +1.75 =7.8+1.75 =9.55

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