问题
解答题
|
答案
(1)1200-397
=1200-400+3
=800+3
=803;
(2)247+3.08+253
=247+253+3.08
=500+3.08
=503.08;
(3)100÷8÷1.25
=100÷(8×1.25)
=100÷10
=10;
(4)15
×76 7
=15×7+
×76 7
=105+6
=111;
(5)5
-61 3
+93 4
-33 4 1 3
=(5
+91 3
)-(63 4
+33 4
)1 3
=15-10
=5;
(6)2.25×4.8+0.48×77.5
=4.8×(2.25+7.75)
=4.8×10
=48.