脱式计算(能简算的要简算) 2.4×1.5+3.6×1.5 0.125×2.5×8 7.38-5.14+3.62-2.86 17.2-7
脱式计算(能简算的要简算)2.4×1.5+3.6×1.50.125×2.5×87.38-5.14+3.62-2.8617.2-7.2×0.68.9×9.941.9-2.0...
脱式计算(能简算的要简算) 2.4×1.5+3.6×1.5 0.125×2.5×8 7.38-5.14+3.62-2.86 17.2-7.2×0.6 8.9×9.9 41.9-2.08-7.92.
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①2.4×1.5+3.6×1.5,
=1.5×(2.4+3.6),
=1.5×6,
=9;
②0.125×2.5×8,
=(0.125×8)×2.5,
=1×2.5,
=2.5;
③7.38-5.14+3.62-2.86,
=(7.38+3.62)-(2.86+5.14),
=11-8,
=3;
④17.2-7.2×0.6,
=17.2-4.32,
=12.88;
⑤8.9×9.9,
=8.9×(10-0.1),
=8.9×10-8.9×0.1,
=89-0.89,
=88.11;
⑥41.9-2.08-7.92,
=41.9-(2.08+7.92),
=41.9-10,
=31.9.
=1.5×(2.4+3.6),
=1.5×6,
=9;
②0.125×2.5×8,
=(0.125×8)×2.5,
=1×2.5,
=2.5;
③7.38-5.14+3.62-2.86,
=(7.38+3.62)-(2.86+5.14),
=11-8,
=3;
④17.2-7.2×0.6,
=17.2-4.32,
=12.88;
⑤8.9×9.9,
=8.9×(10-0.1),
=8.9×10-8.9×0.1,
=89-0.89,
=88.11;
⑥41.9-2.08-7.92,
=41.9-(2.08+7.92),
=41.9-10,
=31.9.
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