脱式计算.((2)(4)题用简便算法计算并写出简算过程)(1)〔6.9÷(3.26-0....
发布网友
发布时间:2024-10-01 10:21
我来回答
共1个回答
热心网友
时间:2024-10-18 01:09
(1)[6.9÷(3.26-0.96)+4.5]×11,
=[6.9÷2.3+4.5]×11,
=[3+4.5]×11,
=7.5×11,
=82.5;
(2)1.8×73.5+27.5×1.8-1.8,
=(73.5+27.5-1)×1.8,
=100×1.8,
=180;
(3)25×[7?4÷(215+23)],
=25×[7?4÷45],
=25×[7?4×54],
=25×[7?5],
=25×2,
=45;
(4)2425×10152011?485×992011,
=2425×(9902011+252011)?48×55×5×992011,
=2425×9902011 +2425×252011-24×1025×992011,
=2425×9902011+242011?2425×10×992011,
=2425×9902011+242011?2425×9902011,
=242011.
热心网友
时间:2024-10-18 01:12
(1)[6.9÷(3.26-0.96)+4.5]×11,
=[6.9÷2.3+4.5]×11,
=[3+4.5]×11,
=7.5×11,
=82.5;
(2)1.8×73.5+27.5×1.8-1.8,
=(73.5+27.5-1)×1.8,
=100×1.8,
=180;
(3)25×[7?4÷(215+23)],
=25×[7?4÷45],
=25×[7?4×54],
=25×[7?5],
=25×2,
=45;
(4)2425×10152011?485×992011,
=2425×(9902011+252011)?48×55×5×992011,
=2425×9902011 +2425×252011-24×1025×992011,
=2425×9902011+242011?2425×10×992011,
=2425×9902011+242011?2425×9902011,
=242011.