问题
填空题
当a=0.8,b=1.2,a+0.7=______;ab=______;4a+5b=______.
答案
当a=0.8,b=1.2时,
a+0.7,
=0.8+0.7,
=1.5;
ab,
=0.8×1.2,
=0.96;
4a+5b,
=4×0.8+5×1.2,
=3.2+6,
=9.2.
故答案为:1.5;0.96;9.2.
当a=0.8,b=1.2,a+0.7=______;ab=______;4a+5b=______.
当a=0.8,b=1.2时,
a+0.7,
=0.8+0.7,
=1.5;
ab,
=0.8×1.2,
=0.96;
4a+5b,
=4×0.8+5×1.2,
=3.2+6,
=9.2.
故答案为:1.5;0.96;9.2.