题目内容
计算下面各题.
(1)38.7+2.5×(36.4-4.8÷0.4)=______
(2)630÷[2.98+6.5×(3.2-3.12)]=______.
(1)38.7+2.5×(36.4-4.8÷0.4)=______
(2)630÷[2.98+6.5×(3.2-3.12)]=______.
(1)38.7+2.5×(36.4-4.8÷0.4),
=38.7+2.5×(36.4-12),
=38.7+2.5×24.4,
=38.7+2.5×(20+4+0.4),
=38.7+[2.5×20+2.5×4+2.5×0.4],
=38.7+[50+10+1],
=38.7+61,
=99.7;
(2)630÷[2.98+6.5×(3.2-3.12)],
=630÷[2.98+6.5×0.08],
=630÷[2.98+0.52],
=630÷3.5,
=180;
故答案为:99.7,180.
=38.7+2.5×(36.4-12),
=38.7+2.5×24.4,
=38.7+2.5×(20+4+0.4),
=38.7+[2.5×20+2.5×4+2.5×0.4],
=38.7+[50+10+1],
=38.7+61,
=99.7;
(2)630÷[2.98+6.5×(3.2-3.12)],
=630÷[2.98+6.5×0.08],
=630÷[2.98+0.52],
=630÷3.5,
=180;
故答案为:99.7,180.
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