题目内容
| 下面各题,怎样算简便就怎样算. 7.8×11-7.8 | 1.25×0.2×50×8 |
| 4.28×1.9+1.9×5.72 | 4.3×1.02. |
(1)7.8×11-7.8,
=7.8×(11-1),
=7.8×10,
=78;
(2)1.25×0.2×50×8,
=(1.25×8)×(0.2×50),
=10×10,
=100;
(3)4.28×1.9+1.9×5.72,
=(4.28+5.72)×1.9,
=10×1.9,
=19;
(4)4.3×1.02,
=4.3×(1+0.02),
=4.3×1+4.3×0.02,
=4.3+0.086,
=4.386.
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