脱式计算:(有简便计算的要简便) 8.08×1.25 49.5×101-49...
脱式计算:(有简便计算的要简便)8.08×1.2549.5×101-49.54.6+5.6×0.8312.8+2.04×9.522-1.6×72.5×0.6-1.8×0....
脱式计算:(有简便计算的要简便) 8.08×1.25 49.5×101-49.5 4.6+5.6×0.83 12.8+2.04×9.5 22-1.6×7 2.5×0.6-1.8×0.5 0.25×13.7×0.4 25.6-5.6×0.4 104×2.5.
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(1)8.08×1.25
=(8+0.08)×1.25
=8×1.25+0.08×1.25
=10+0.1
=10.1
(2)49.5×101-49.5
=49.5×(101-1)
=49.5×100
=4950
(3)4.6+5.6×0.83
=4.6+4.648
=9.248
(4)12.8+2.04×9.5
=12.8+19.38
=32.18
(5)22-1.6×7
=22-11.2
=10.8
(6)2.5×0.6-1.8×0.5
=1.5-0.9
=0.6
(7)0.25×13.7×0.4
=(0.25×0.4)×13.7
=0.1×13.7
=1.37
(8)25.6-5.6×0.4
=25.6-2.24
=23.36
(9)104×2.5
=(100+4)×2.5
=100×2.5+4×2.5
=250+10
=260
=(8+0.08)×1.25
=8×1.25+0.08×1.25
=10+0.1
=10.1
(2)49.5×101-49.5
=49.5×(101-1)
=49.5×100
=4950
(3)4.6+5.6×0.83
=4.6+4.648
=9.248
(4)12.8+2.04×9.5
=12.8+19.38
=32.18
(5)22-1.6×7
=22-11.2
=10.8
(6)2.5×0.6-1.8×0.5
=1.5-0.9
=0.6
(7)0.25×13.7×0.4
=(0.25×0.4)×13.7
=0.1×13.7
=1.37
(8)25.6-5.6×0.4
=25.6-2.24
=23.36
(9)104×2.5
=(100+4)×2.5
=100×2.5+4×2.5
=250+10
=260
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