题目内容
怎样简便怎样算.
| 8.2×99+8.2 | 4.8×0.25 | 0.78×9.9 |
| 8.96×0.32-0.96×0.32 | 2.6×1.9÷2.6×1.9. |
①8.2×99+8.2,
=8.2×(99+1),
=8.2×100,
=820;
②4.8×0.25,
=4×1.2×0.25,
=(4×0.25)×1.2,
=1×1.2,
=1.2;
③0.78×9.9,
=0.78×(10-0.1),
=0.78×10-0.78×0.1,
=7.8-0.078,
=7.722;
④8.96×0.32-0.96×0.32,
=0.32×(8.96-0.96),
=0.32×8,
=2.56;
⑤2.6×1.9÷2.6×1.9,
=1.9×2.6÷2.6×1.9,
=1.9×1.9,
=3.61.
=8.2×(99+1),
=8.2×100,
=820;
②4.8×0.25,
=4×1.2×0.25,
=(4×0.25)×1.2,
=1×1.2,
=1.2;
③0.78×9.9,
=0.78×(10-0.1),
=0.78×10-0.78×0.1,
=7.8-0.078,
=7.722;
④8.96×0.32-0.96×0.32,
=0.32×(8.96-0.96),
=0.32×8,
=2.56;
⑤2.6×1.9÷2.6×1.9,
=1.9×2.6÷2.6×1.9,
=1.9×1.9,
=3.61.
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