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8.7+1.2X0.35用简便方式算

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

有采纳

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

9.084

=7.8x(10+0.1)=7.8x10+7.8x0.1=78+0.78=78.78

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

=2.3x(7.8+2.1)+9.9x7.7 =9.9x2.3+9.9x7.7 =9.9x10 =99

供参考

(1)1.28×8.6+7.2×0.86=12.8×0.86+7.2×0.86=(12.8+7.2)×0.86=20×0.86=17.2;(2)0.35×1.25×2×0.8=0.35×2×(0.8×1.25)=0.7×1=0.7;(3)56.5×9.9+56.5=56.5×(9.9+1)=56.5×10.9=615.85;(4)75×4.7+15.9×25=75×4.7+5.3×75=(4.7+5.3)×75=...

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