1樓:kyoya雀
(1)7.8÷1.25÷8
=7.8÷(抄
襲1.25×8)
=7.8÷10
=0.78
(2)0.67×99+0.67
=0.67×(99+1)
=0.67×100
=67(3)3.76×2.9-1.9×3.76=3.76×(2.9-1.9)
=3.76×1
=3.76
(4)2.5×3.2×1.25
=(2.5×4)×(0.8×1.25)
=10×1
=10(5)0.38+9.62÷3.7×5.2=0.38+2.6×5.2
=0.38+13.52
=13.9
(6)7.8×3.2+7.8×7.8-7.8=7.8×(3.2+7.8-1)
=7.8×10=78
脫式計算(能簡算的要用簡便方法計算): 180÷(1-84%) 25-5× 2 5 +
2樓:臥牛
180÷(1-84%),
=80÷0.16,
=500;
25-5×2 5
+3 5
,=5-2+3 5
,=33 5
;30.25×32×12.5%,
=0.25×4×8×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;47 9
÷11 5
+2 9
×511
,=7 9
×511
+2 9
×511
,=(7 9
+2 9
)×511
,=1×5
11,=511.
3樓:冼棟屈嘉穎
解:180÷(1-84%),
=80÷0.16,
=500;
25-5×
25+35,
=5-2+35,
=335;
30.25×32×12.5%,
=0.25×4×8×0.125,
=(0.25×4)×(8×0.125),
=1×1,
=1;479÷115+29×511,
=79×511+29×511,
=(79+29)×511,
=1×511,
=511.
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