9.2×1.05÷3.4保留两位小数
计算.(能简算的要简算)①0.25×6.82×4②1.344+0.162÷4③12.68-4.8-3.68④3.6÷1.2-0.8×2.7⑤9.2×1.05÷3.4⑥(2...
计算.(能简算的要简算) ①0.25×6.82×4 ②1.344+0.162÷4 ③12.68-4.8-3.68 ④3.6÷1.2-0.8×2.7 ⑤9.2×1.05÷3.4 ⑥(2.6+3.2÷1.28)÷1.7(得数保留两位小数) ⑦6.83×(3.8-2.3)+1.5×3.7 ⑧4.5×[7.68÷(8.2-1.8)].
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(1)0.25×6.82×4,
=(0.25×4)×6.82,
=1×6.82,
=6.82;
(2)1.344+0.162÷4,
=1.344+0.0405,
=1.3845;
(3)12.68-4.8-3.68,
=12.68-3.68-4.8,
=9-4.8,
=4.2;
(4)3.6÷1.2-0.8×2.7,
=3-2.16,
=0.84;
(5)9.2×1.05÷3.4,
=9.66÷3.4,
≈2.84
(6)(2.6+3.2÷1.28)÷1.7,
=(2.6+2.5)÷1.7,
=5.1÷1.7,
=3.00;
(7)6.83×(3.8-2.3)+1.5×3.7,
=6.83×1.5+1.5×3.7,
=(6.83+3.7)×1.5,
=10.53×1.5,
=15.795;
(8)4.5×[7.68÷(8.2-1.8)],
=4.5×[7.68÷6.4],
=4.5×1.2,
=5.4.
=(0.25×4)×6.82,
=1×6.82,
=6.82;
(2)1.344+0.162÷4,
=1.344+0.0405,
=1.3845;
(3)12.68-4.8-3.68,
=12.68-3.68-4.8,
=9-4.8,
=4.2;
(4)3.6÷1.2-0.8×2.7,
=3-2.16,
=0.84;
(5)9.2×1.05÷3.4,
=9.66÷3.4,
≈2.84
(6)(2.6+3.2÷1.28)÷1.7,
=(2.6+2.5)÷1.7,
=5.1÷1.7,
=3.00;
(7)6.83×(3.8-2.3)+1.5×3.7,
=6.83×1.5+1.5×3.7,
=(6.83+3.7)×1.5,
=10.53×1.5,
=15.795;
(8)4.5×[7.68÷(8.2-1.8)],
=4.5×[7.68÷6.4],
=4.5×1.2,
=5.4.
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