递等式计算,写出必要的计算过程,能简便计算的用简便方法计算:(1)7.06×2.4-5.7 (2)5.4×99+5.4
递等式计算,写出必要的计算过程,能简便计算的用简便方法计算:(1)7.06×2.4-5.7(2)5.4×99+5.4(3)9.6×72+9.6×28(4)(1.25×2....
递等式计算,写出必要的计算过程,能简便计算的用简便方法计算:(1)7.06×2.4-5.7 (2)5.4×99+5.4 (3)9.6×72+9.6×28(4)(1.25×2.5)×4 (5)10.4+72×0.81 (6)11×0.6×0.4(7)(12.8+4.99)÷0.2 (8)1.25×8+2.5×4.4.
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(1)7.06×2.4-5.7,
=16.944-5.7,
=11.244;
(2)5.4×99+5.4,
=5.4×(99+1),
=5.4×100,
=540;
(3)9.6×72+9.6×28,
=9.6×(72+28),
=9.6×100,
=960;
(4)(1.25×2.5)×4,
=1.25×(2.5×4),
=1.25×10,
=12.5;
(5)10.4+72×0.81,
=10.4+58.32,
=68.72;
(6)11×0.6×0.4,
=6.6×0.4,
=2.64;
(7)(12.8+4.99)÷0.2,
=17.79÷0.2,
=88.95;
(8)1.25×8+2.5×4.4,
=10+2.5×0.4×11,
=10+11,
=21.
=16.944-5.7,
=11.244;
(2)5.4×99+5.4,
=5.4×(99+1),
=5.4×100,
=540;
(3)9.6×72+9.6×28,
=9.6×(72+28),
=9.6×100,
=960;
(4)(1.25×2.5)×4,
=1.25×(2.5×4),
=1.25×10,
=12.5;
(5)10.4+72×0.81,
=10.4+58.32,
=68.72;
(6)11×0.6×0.4,
=6.6×0.4,
=2.64;
(7)(12.8+4.99)÷0.2,
=17.79÷0.2,
=88.95;
(8)1.25×8+2.5×4.4,
=10+2.5×0.4×11,
=10+11,
=21.
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