(247) 3.4÷[(1.2+0.5)×5] (248)8×(20﹣1.25)(249)0.654+10.9×6.5 (250)22.7×1.25×0.8
(251) 3.91×2.8+6.09×2.8.(252) 6.23+3.09=
(253)132.4﹣59.8=
(254) 6.62×0.84=
(255) 2.07÷0.023=
(256) [20.026﹣(8.6+9.7)×
0.92]÷30.19.
(257)0.125×32×2.5
(258)0.8×6.3﹣0.8×3.8 (259)50.4÷3.2×2.08
(260)204÷(3.4×0.5)
(261)(43.26+2.34)÷7.5
(262)(20﹣0.8×9)×5.7.
(263) 13.25﹣0.8+1.75﹣1.2;
(264) 2.5×99+2.5;
(265) 10.36+4.8﹣16.5÷5;
(266) 12.5×2.4.
(267) 38.78﹣19.59+41.22﹣
30.41
(268) 2.74×4.86+4.86×
6.26+4.86
(269) 0.08×(12.5+2.5)×0.1
(270) 25.92+(10.1﹣14.5×
0.2)
(271) 0.487×12.5÷48.7
(272) (8.16+2.09)÷[(10.3
﹣9.3)÷0.4].
(273) 1.56×1.7+0.44×1.7
(274)12.5×(7.2﹣1.9)×0.8
(275) 0.25×2010+20.10×75
(276) 30.8÷[(6.34﹣4.59)×4].
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