用递等式计算,能简便计算的要简算.(1)2.01×1.53÷0.18(2)5.86×99.4+5.86×0.6(3)2.2×2.2+2.2
用递等式计算,能简便计算的要简算.(1)2.01×1.53÷0.18(2)5.86×99.4+5.86×0.6(3)2.2×2.2+2.2×7.8(4)0.25×(4.8...
用递等式计算,能简便计算的要简算.(1)2.01×1.53÷0.18(2)5.86×99.4+5.86×0.6(3)2.2×2.2+2.2×7.8(4)0.25×(4.83-0.85)(5)(12.5+1.25+0.125)×8(6)(148.4-90.85)÷2.5.
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(1)2.01×1.53÷0.18,
=3.0753÷0.18,
=17.085;
(2)5.86×99.4+5.86×0.6,
=5.86×(99.4+0.6),
=5.86×100,
=586;
(3)2.2×2.2+2.2×7.8,
=2.2×(2.2+7.8),
=2.2×10,
=22;
(4)0.25×(4.83-0.85),
=0.25×3.98,
=0.25×4-0.25×0.02,
=1-0.005,
=0.995;
(5)(12.5+1.25+0.125)×8,
=12.5×8+1.25×8+0.125×8,
=100+10+1,
=110+1,
=111;
(6)(148.4-90.85)÷2.5,
=57.55÷2.5,
=23.02.
=3.0753÷0.18,
=17.085;
(2)5.86×99.4+5.86×0.6,
=5.86×(99.4+0.6),
=5.86×100,
=586;
(3)2.2×2.2+2.2×7.8,
=2.2×(2.2+7.8),
=2.2×10,
=22;
(4)0.25×(4.83-0.85),
=0.25×3.98,
=0.25×4-0.25×0.02,
=1-0.005,
=0.995;
(5)(12.5+1.25+0.125)×8,
=12.5×8+1.25×8+0.125×8,
=100+10+1,
=110+1,
=111;
(6)(148.4-90.85)÷2.5,
=57.55÷2.5,
=23.02.
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