问题
填空题
3a+2.1=b,当b等于6.3时,a=______;当a等于1.8时,b等于______.
答案
b等于6.3时,
3a+2.1=6.3,
3a=4.2,
a=1.4;
当a等于1.8时,
b=3×1.8+2.1,
b=5.4+2.1,
b=7.5.
故答案为:1.4,7.5.
3a+2.1=b,当b等于6.3时,a=______;当a等于1.8时,b等于______.
b等于6.3时,
3a+2.1=6.3,
3a=4.2,
a=1.4;
当a等于1.8时,
b=3×1.8+2.1,
b=5.4+2.1,
b=7.5.
故答案为:1.4,7.5.