拖式计算,能用简便方法计算用简便方法.17.5÷12.5×1.4 &nb...
拖式计算,能用简便方法计算用简便方法.17.5÷12.5×1.41.58×99+1.584.38÷0.125÷0.86,4×4.5+3.6×4.5?21÷0.25÷0.4...
拖式计算,能用简便方法计算用简便方法.17.5÷12.5×1.4 1.58×99+1.58 4.38÷0.125÷0.8 6,4×4.5+3.6×4.5 ?21÷0.25÷0.4 2×9.9+0.1 0.125×3.2×0.25 3.5×0.7+5.5×0.7+0.7.
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(1)17.5÷12.5×1.4
=1.4×1.4
=1.96;
(2)1.58×99+1.58
=1.58×(99+1)
=1.58×100
=158;
(3)4.38÷0.125÷0.8
=4.38÷(0.125×0.8)
=4.38÷0.1
=43.8;
(4)6.4×4.5+3.6×4.5
=(6.4+3.6)×4.5
=10×4.5
=45;
(5)21÷0.25÷0.4
=21÷(0.25×0.4)
=21÷0.1
=210;
(6)2×9.9+0.1
=19.8+0.1
=19.9;
(7)0.125×3.2×0.25
=0.125×8×(0.4×0.25)
=1×0.1
=0.1;
(8)3.5×0.7+5.5×0.7+0.7
=(3.5+5.5+1)×0.7
=10×0.7
=7.
=1.4×1.4
=1.96;
(2)1.58×99+1.58
=1.58×(99+1)
=1.58×100
=158;
(3)4.38÷0.125÷0.8
=4.38÷(0.125×0.8)
=4.38÷0.1
=43.8;
(4)6.4×4.5+3.6×4.5
=(6.4+3.6)×4.5
=10×4.5
=45;
(5)21÷0.25÷0.4
=21÷(0.25×0.4)
=21÷0.1
=210;
(6)2×9.9+0.1
=19.8+0.1
=19.9;
(7)0.125×3.2×0.25
=0.125×8×(0.4×0.25)
=1×0.1
=0.1;
(8)3.5×0.7+5.5×0.7+0.7
=(3.5+5.5+1)×0.7
=10×0.7
=7.
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