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49×3.25+959×314;4517-(1517+0.625);(25+12)×(4-2

2022-08-14 02:40:47 问答库 阅读 200 次

问题详情

4

9

×3.25+95

9

×31

4

;45

17

-(15

17

+0.625);

(2

5

+1

2

)×(4-22

3

);3.12÷1.2-1.2×0.6;

1998+7650÷75;(11

4

+25

6

)÷(11

4

×0.8-0.3).

参考答案

(1)49×3.25+959×314
=49×3.25+959×3.25
=(49+959)×3.25
=10×3.25
=32.5;

(2)4517-(1517+0.625)
=4517-1517-0.625
=(4517-1517)-0.625
=3-0.625
=2.375;

(3)(25+12)×(4-223)
=910×43
=65;

(4)3.12÷1.2-1.2×0.6
=2.6-0.72
=1.88;

(5)1998+7650÷75
=1998+102
=2100;

(6)(114+256)÷(114×0.8-0.3)
=4912÷(1-0.3)
=4912÷0.7
=4912÷710
=4912×107
=356.

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