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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....

原式等于 11.7+6.3=18 所以原式的计算结果为18.

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

0.8×6.5×4.2的简便计算 =0.8X5X1.3x4.2 =(0.8x5)x4.2×1.3 =4x4.2x1.3 =16.8x(1+0.3) =16.8x1+16.8x0.3 =16.8+5.04 =21.84

1/2×5+13/2×1/4-1/4×3/2 =5/2+1/4(13/2-3/2) =5/2+1/4×5 =10/4+5/4 =15/4

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

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

原式=6.5X2X0.9-1.84 =13X(1-0.1)-1.84 =13-1.3-1.84 =13-(1.3+1.84) =13-3.14 =13-3-0.14 =10-0.14 =9.86

题目真看不懂啊,你没打错吧,为什么23.5和6.5之间没有符号呢

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