题目内容
| 怎样简便就怎样算. ①400-(1300÷65+35) | ②29+29×29 | ③15×(41-17)÷30 | ④19×96+962÷74 |
| ⑤25×44 | ⑥355+260+140+245 | ⑦50×25×20×40 | ⑧645-180-245. |
①400-(1300÷65+35),
=400-(20+35),
=400-55,
=345;
②29+29×29,
=(1+29)×29,
=30×29,
=870;
③15×(41-17)÷30,
=15×24÷30,
=360÷30,
=12;
④19×96+962÷74,
=1824+13,
=1837;
⑤25×44,
=25×(4×11),
=25×4×11,
=100×11,
=1100;
⑥355+260+140+245,
=(355+245)+(260+140),
=600+400,
=1000;
⑦50×25×20×40,
=(50×20)×(25×40),
=1000×1000,
=1000000;
⑧645-180-245,
=645-245-180,
=400-180,
=220.
=400-(20+35),
=400-55,
=345;
②29+29×29,
=(1+29)×29,
=30×29,
=870;
③15×(41-17)÷30,
=15×24÷30,
=360÷30,
=12;
④19×96+962÷74,
=1824+13,
=1837;
⑤25×44,
=25×(4×11),
=25×4×11,
=100×11,
=1100;
⑥355+260+140+245,
=(355+245)+(260+140),
=600+400,
=1000;
⑦50×25×20×40,
=(50×20)×(25×40),
=1000×1000,
=1000000;
⑧645-180-245,
=645-245-180,
=400-180,
=220.
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