问题
解答题
先化简,再求值.
当a=4.8,b=2.5时,求5a+1.6b+2.4b的值.
答案
5a+1.6b+2.4b,
=5a+(1.6+2.4)b,
=5a+4b,
当a=4.8,b=2.5时,
5a+4b
=5×4.8+4×2.5,
=24+10,
=34.
先化简,再求值.
当a=4.8,b=2.5时,求5a+1.6b+2.4b的值.
5a+1.6b+2.4b,
=5a+(1.6+2.4)b,
=5a+4b,
当a=4.8,b=2.5时,
5a+4b
=5×4.8+4×2.5,
=24+10,
=34.