题目内容
(1)已知:8x=44.8,那么:0.38+1.2x=
(2)已知:6x=36,那么:7x-
7.1
7.1
(2)已知:6x=36,那么:7x-
12.5
12.5
=29.5.分析:(1)因为8x=44.8,则等式的两边同时除以8,即可得出x的值,将x的值代入0.38+1.2x,问题即可得解;
(2)因为6x=36,则等式的两边同时除以6,即可得出x的值,再依据“被减数-差=减数”即可得解.
(2)因为6x=36,则等式的两边同时除以6,即可得出x的值,再依据“被减数-差=减数”即可得解.
解答:解:(1)8x=44.8,
8x÷8=44.8÷8,
x=5.6;
0.38+1.2×5.6,
=0.38+6.72,
=7.1;
(2)6x=36,
6x÷6=36÷6,
x=6,
7×6-29.5,
=42-29.5,
=12.5;
故答案为:7.1、12.5.
8x÷8=44.8÷8,
x=5.6;
0.38+1.2×5.6,
=0.38+6.72,
=7.1;
(2)6x=36,
6x÷6=36÷6,
x=6,
7×6-29.5,
=42-29.5,
=12.5;
故答案为:7.1、12.5.
点评:此题主要依据等式的性质和被减数、减数、差的关系解决问题,关键是先求出x的值.
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