3 运动定律与简便运算
脱式计算,能简算的要简算:
4.67﹣(2.98+0.67);
÷[
﹣(
+
)]; 8×0.4×12.5×2.5;
125×(8+0.8+0.08); 1.89×0.9+0.189; 23.8×99+2.38.
计算:
(1)19175÷59+678
(2)36.5×1.4﹣8.51÷3.7
(3)4
+4
÷3
×1
(4)4.6×
+0.6×3.4+2×
(5)[1
+(2
﹣0.35)×
]÷12.
脱式计算(能箭算的要箭算)
6.5×8+3.5×8﹣44 138×99 (999+111)÷[56×(
﹣
)]
(1.9+1.9+1.9+1.9)×2.5 [2﹣(11.9﹣8.4×1
)]÷1.3.
计算下列各题:
(1)1.8×(4.7﹣3.87÷0.9)=
(2)
×8.5+
×8.5=
(3)9.72×1.6﹣18.305÷7=
(4)5.97+3.8×7.2﹣24.6=
计算,能简算的要写出简算过程.
①4×0.8×2.5×12.5
②0.65×14+87×65%﹣65%
③42÷[14﹣(50﹣39)]
④2.25×4.8+77.5×0.48.
口算.(近似值符号的是估算题)
0.105×100= 1993+1994= 603×39≈ 4950÷51= 112﹣102=
16×0.25= 19÷9﹣10÷9=
﹣
= 8π≈ 2.63+3.7=
1﹣
+
= 7×8×(
+
)= 1﹣
÷
=
÷
×0=
能简算的要简算
0.125×0.25×32= ; 3.25×25+32.5×7.5= ;
4.06×76+4.06×25﹣4.06= ; 0.125×
+
×8.25+12.5%= .
混合计算(能简算的要简算).
1.28+90.8+9.72+9.2 5.37﹣1.47﹣2.53
×
+
÷
1500﹣18×120÷25
÷[
×(0.4+
)].





+
)×13×18
×9﹣6÷
×[1÷(
﹣
)].
+
)÷
〕×
; 1﹣(
﹣
)×3;
+
)×
.
÷
+
×
+
×
﹣
)]×
(
+
)×23+
.

.
×1.67+0.33×
×4
12×(
+
﹣
)
×[
﹣(
﹣25%)]
﹣4.5)×1
]÷2
×3+
.
÷[
﹣(
+
)];
÷23+
×
+
.
×(
+
) (3)24×
+19×
(4)3.6×[2÷(
﹣0.2)].
4.8×
+6.2÷1
﹣0.8.
75×32×1.25 101×93﹣93 43×6.9+69×5.7.
+4.8﹣
0.7÷[(
﹣
)×24].
0.38×
.
= 99×
= 992+99=
= (0.18+
)÷9=
×
.
+
(40+4+0.4)×2.5
×
+
×
(
+
)×27×23.
)÷9 105×13﹣1890÷18 36÷[(
﹣
)×3]
×
+
+
)×8 1.6×[1÷(2.1﹣2.09)] 7.8×2.5+7.5×7.8 [1﹣(
﹣
)]×
.
2.5+2.8+2.2+6.5 0.75×99.
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