1樓:姿態
①3.6-2.8+7.4-7.2
=3.6+7.4-(2.8+7.2)
=11-10
=1;②8
17÷23+1
23 ×
9 17
+123 =8
17×1
23+1
23×9
17+1
23×1
=(8 17
+917
+1)×1
23=2×1
23 =2
23;③(1 2
+1 3
)÷3 5
-1718 =5
6÷3 5
-1718
=2518
-1718 =4
9;④18÷[5 6
+(5 8
-1 3
)]=18÷(5 6
+724
)=18÷27
24=16.
用遞等式計算,能簡算的要寫出簡算過程. (2.5×6+2.5×4)÷5 35.6-2.8+4.4-7.2 0.25×3.2×12.
2樓:最強黑客
(1)(2.5×6+2.5×4)÷5,
=2.5×(6+4)÷5,
=2.5×10÷5,
=25÷5,
=5;(2)35.6-2.8+4.4-7.2,=(35.6+4.4)-(2.8+7.2),=40-10,
=30;
(3)0.25×3.2×12.5,
=0.25×4×0.8×12.5,
=(0.25×4)×(0.8×12.5),=1×10,
=10;
(4)7.5÷(1.5+2.5),
=7.5÷4,
=1.875;
(5)0.6×(5+0.6)-1,
=0.6×5+0.6×0.6-1,
=3+0.36-1,
=3.36-1,
=2.36;
(6)3.7×1.25-3.7×0.25,=3.7×(1.25-0.25),
=3.7×1,
=3.7.
2.8-5又4/9+7.2-3又5/9 脫式計算 能簡算就簡算
3樓:新野旁觀者
脫式計算 能簡算就簡算
2.8-5又4/9+7.2-3又5/9
=(2.8+7.2)-(5又4/9+3又5/9 )=10-9=1
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