脱式计算,能简算的要简算. 0.9×2.5×0.4 1.25×3.4×0.8 17.8×99.
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(1)0.9×2.5×0.4
=0.9×(2.5×0.4)
=0.9×1
=0.9;
(2)1.25×3.4×0.8
=1.25×0.8×3.4
=1×3.4
=3.4;
(3)17.8×99
=17.8×(100-1)
=17.8×100-17.8×1
=1780-17.8
=1762.2.
=0.9×(2.5×0.4)
=0.9×1
=0.9;
(2)1.25×3.4×0.8
=1.25×0.8×3.4
=1×3.4
=3.4;
(3)17.8×99
=17.8×(100-1)
=17.8×100-17.8×1
=1780-17.8
=1762.2.
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