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8.7+1.2X0.35用简便方式算

=8.7+0.3×4×0.35 =8.7+0.3×0.13 =8.7+0.39 =10.09

8.7+1.2x0.35 =8.7+(1+0.2)x0.35 =8.7+1x0.35+0.2x0.35 =8.7+0.35+0.07 =9.12

8.7+1.2×0.35 =8.7+0.6*2*0.35 =8.7+0.6*0.7 =8.7+0.42 =9.12

提取公因式 得 7.8x(1.4+2.6+3.5+1)-2 =7.8x8.5-2 =64.3

8.7 1点3×2点31-0点31 =8.7+1.3*2.31-0.31 =8.7+3.003-0.31 =11.393

供参考

88.8×8.7+11.2×9.9-11.2×1.2 =88.8×8.7+11.2×(9.9-1.2) =88.8×8.7+11.2×8.7 =(88.8+11.2)×8.7 =100×8.7 =870

拿什么来抚慰仓皇失措,恐惧无助的灵魂?

7.8×1.2+22×0.12 =1.2×(7.8+2.2) =1.2×10 =12

解:采用结合律, 原式=7/8-(1/3+1/4) =7/8-1/4-1/3 =7/8-2/8-1/3 =5/8-1/3 =15/24-8/24 =7/24

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