计算下面各题,能用简便方法的要用简便方法计算. (1)9.78×2.3+2.3×10.22 (2)1.5×11-7.83+3.5 (3)7.25÷(31-29.55)×1.3 (4)75.6÷[0.7×(8.5-7.6)].
(1)9.78×2.3+2.3×10.22,
=(9.78+10.22)×2.3,
=20×2.3,
=46;
(2)1.5×11-7.83+3.5,
=16.5-7.83+3.5,
=8.67+3.5,
=12.17;
(3)7.25÷(31-29.55)×1.3,
=7.25÷1.45×1.3,
=5×1.3,
=6.5;
(4)75.6÷[0.7×(8.5-7.6)],
=75.6÷[0.7×0.9],
=75.6÷0.63,
=120.
=(9.78+10.22)×2.3,
=20×2.3,
=46;
(2)1.5×11-7.83+3.5,
=16.5-7.83+3.5,
=8.67+3.5,
=12.17;
(3)7.25÷(31-29.55)×1.3,
=7.25÷1.45×1.3,
=5×1.3,
=6.5;
(4)75.6÷[0.7×(8.5-7.6)],
=75.6÷[0.7×0.9],
=75.6÷0.63,
=120.
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