脱式计算(能简算的要用简算) 4.2×7.8+2.2×4.2 9.5×101 (8
脱式计算(能简算的要用简算)4.2×7.8+2.2×4.29.5×101(8×3.82)×1.250.125×72....
脱式计算(能简算的要用简算) 4.2×7.8+2.2×4.2 9.5×101 (8×3.82)×1.25 0.125×72.
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1;4.2×7.8+2.2×4.2,
=(7.8+2.2)×4.2,
=10×4.2,
=42;
2;9.5×101,
=9.5×(100+1),
=9.5×100+9.5×1,
=950+9.5,
=959.5;
3;(盯蔽8×3.82)凯芹州×1.25,
=8×3.82×1.25,
=(8×1.25)×3.82,
=10×3.82,
=38.2;
4;首乱0.125×72,
=0.125×8×9,
=1×9,
=9.
=(7.8+2.2)×4.2,
=10×4.2,
=42;
2;9.5×101,
=9.5×(100+1),
=9.5×100+9.5×1,
=950+9.5,
=959.5;
3;(盯蔽8×3.82)凯芹州×1.25,
=8×3.82×1.25,
=(8×1.25)×3.82,
=10×3.82,
=38.2;
4;首乱0.125×72,
=0.125×8×9,
=1×9,
=9.
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