题目内容
| ①245-65-35 | ②9.8+2.5+10.2+7.5 | ③1.25×32×2.5. |
①245-65-35,
=245-(65+35),
=245-100,
=145;
②9.8+2.5+10.2+7.5,
=(9.8+10.2)+(2.5+7.5),
=20+10,
=30;
③1.25×32×2.5,
=1.25×(8×4)×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100.
=245-(65+35),
=245-100,
=145;
②9.8+2.5+10.2+7.5,
=(9.8+10.2)+(2.5+7.5),
=20+10,
=30;
③1.25×32×2.5,
=1.25×(8×4)×2.5,
=(1.25×8)×(4×2.5),
=10×10,
=100.
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