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0.247.52.5用简便方法

0.24+7.5+2.5 =0.24+(7.5+2.5) =0.24+10 =10.24 0.24×7.5×2.5 =(0.6×7.5)×(0.4×2.5) =4.5×1 =4.5

12×23= 13×26=

1.125*3+125*5+25*3+25 2.9999*3+101*11*(101-92) 3.(23/4-3/4)*(3*6+2) 4. 3/7 × 49/9 - 4/3 5. 8/9 × 15/36 + 1/27 6. 12× 5/6 – 2/9 ×3 7. 8× 5/4 + 1/4 8. 6÷ 3/8 – 3/8 ÷6 9. 4/7 × 5/9 + 3/7 × 5/9 10. 5/2 -( 3/2 + 4/5 ) 11. 7/8 + (...

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