问题
解答题
已知a=5,b=0.4,c=21式子3a-6b+2c的值是______.
答案
3a-6b+2c,
=3×5-6×0.4+2×21,
=15-2.4+42,
=12.6+42,
=54.6;
故答案为:54.6.
已知a=5,b=0.4,c=21式子3a-6b+2c的值是______.
3a-6b+2c,
=3×5-6×0.4+2×21,
=15-2.4+42,
=12.6+42,
=54.6;
故答案为:54.6.