第47页

信息发布者:
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79
+
121
×
0.4
×
4.5
×
200
-
4.5
×
2
$a$
99
+
1
$6×(22÷4)-1.4=31.6$
1.1
C
D
B
​$=\frac {7}{19}+\frac {10}{19}$​
​$=\frac {17}{19}$​
=63.3÷(24.3×2-6.4)
=63.3÷42.2
=1.5
=(125×8)×(0.4×0.25)
=1000×0.1
=100
=(12.3+5.7)-(2.45+4.55)
=18-7
=11
=150÷(1.25×80)
=150÷100
=1.5
​$=\frac {2}{5}×60+\frac {3}{4}×60-\frac {1}{2}×60$​
​$=24+45-30$​
​$=39$​
​$5△ 2=5×5−4×2=17$​
​$4*2=4×2-(4+2)=2$​
​$5*2=5×2-(5+2)=3$​