计算下面各题,能简算的要简算. 45×97+45×3 483-154-46 9.63-2.74+0.37-2.26 69×102 7.
计算下面各题,能简算的要简算.45×97+45×3483-154-469.63-2.74+0.37-2.2669×1027.34-(2.59+1.34)57×99+57....
计算下面各题,能简算的要简算. 45×97+45×3 483-154-46 9.63-2.74+0.37-2.26 69×102 7.34-(2.59+1.34) 57×99+57.
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①45×97+45×3
=45×(97+3)
=45×100
=4500
②483-154-46
=483-(154+46)
=483-200
=283
③9.63-2.74+0.37-2.26
=(9.63+0.37)-(2.74+2.26)
=10-5
=5
④69×102
=69×(100+2)
=69×100+69×2
=6900+138
=7038
⑤7.34-(2.59+1.34)
=7.34-1.34-2.59
=6-2.59
=3.41
⑥57×99+57
=57×99+57×1
=57×(99+1)
=57×100
=5700
=45×(97+3)
=45×100
=4500
②483-154-46
=483-(154+46)
=483-200
=283
③9.63-2.74+0.37-2.26
=(9.63+0.37)-(2.74+2.26)
=10-5
=5
④69×102
=69×(100+2)
=69×100+69×2
=6900+138
=7038
⑤7.34-(2.59+1.34)
=7.34-1.34-2.59
=6-2.59
=3.41
⑥57×99+57
=57×99+57×1
=57×(99+1)
=57×100
=5700
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