巧算.12.5×3.
巧算.12.5×3.5×0.83.6÷1.2÷37.2×7.2+3.8×7.2-7.2...
巧算.12.5×3.5×0.8 3.6÷1.2÷3 7.2×7.2+3.8×7.2-7.2
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(1)12.5×3.5×0.8 =12.5×0.8×3.5 =10×3.5 =35;
(2)3.6÷1.2÷3 =3.6÷(1.2×3) =3.6÷3.6 =1;
(3)7.2×7.2+3.8×7.2-7.2 =7.2×(7.2+3.8-1) =7.2×10 =72. |
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