计算下面各题,能简算的要简算.(1)9.86-3.4÷1.7×1.3 (2)0.36×3.9+3.9×1.64 (3)7.23-(2.8+1
计算下面各题,能简算的要简算.(1)9.86-3.4÷1.7×1.3(2)0.36×3.9+3.9×1.64(3)7.23-(2.8+1.23)(4)1.64×2.5+2...
计算下面各题,能简算的要简算.(1)9.86-3.4÷1.7×1.3 (2)0.36×3.9+3.9×1.64 (3)7.23-(2.8+1.23) (4)1.64×2.5+2.1÷0.6 (5)2.4×(0.85÷1.7)-1.08 (6)0.04×[(17.6-14.1)÷1.4].
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(1)9.86-3.4÷1.7×1.3,
=9.86-2×1.3,
=9.86-2.6,
=7.26;
(2)0.36×3.9+3.9×1.64,
=3.9×(0.36+1.64),
=3.9×2,
=7.8;
(3)7.23-(2.8+1.23),
=7.23-1.23-2.8,
=6-2.8,
=3.2;
(4)1.64×2.5+2.1÷0.6,
=4.1+3.5,
=7.6;
(5)2.4×(0.85÷1.7)-1.08,
=2.4×0.5-1.08.
=1.2-1.08,
=0.12;
(6)0.04×[(17.6-14.1)÷1.4],
=0.04×(3.5÷1.4),
=0.04×2.5,
=0.1.
=9.86-2×1.3,
=9.86-2.6,
=7.26;
(2)0.36×3.9+3.9×1.64,
=3.9×(0.36+1.64),
=3.9×2,
=7.8;
(3)7.23-(2.8+1.23),
=7.23-1.23-2.8,
=6-2.8,
=3.2;
(4)1.64×2.5+2.1÷0.6,
=4.1+3.5,
=7.6;
(5)2.4×(0.85÷1.7)-1.08,
=2.4×0.5-1.08.
=1.2-1.08,
=0.12;
(6)0.04×[(17.6-14.1)÷1.4],
=0.04×(3.5÷1.4),
=0.04×2.5,
=0.1.
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