49×3.25+959×314;4517-(1517+0.625);(25+12)×(4-223);3.12÷1.2-1.2×0.6;1998+7650÷75;(114+256)÷(114×0.8-0.3).
×3.25+9×3; | 4-(1+0.625); |
(+)×(4-2); | 3.12÷1.2-1.2×0.6; |
1998+7650÷75; | (1+2)÷(1×0.8-0.3). |
答案和解析
(1)
×3.25+9×3
=×3.25+9×3.25
=(+9)×3.25
=10×3.25
=32.5;
(2)4-(1+0.625)
=4-1-0.625
=(4-1)-0.625
=3-0.625
=2.375;
(3)(+)×(4-2)
=×
=;
(4)3.12÷1.2-1.2×0.6
=2.6-0.72
=1.88;
(5)1998+7650÷75
=1998+102
=2100;
(6)(1+2)÷(1×0.8-0.3)
=÷(1-0.3)
=÷0.7
=÷
=×
=.
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