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小数混合运算专项训练
1、解方程
(1)5x=450
(2)12(6-x)=42
(3)
1.2×6+4x=12
(4)
8.5x-x=
22.
52、用简便方法计算
(1)
0.25×
3.2×
12.5
(2)36×
10.1
(3)
0.25×44
(4)
22.2×4+
17.8×
43、用脱式计算
(1)
2.6+
1.4×
1.5-
1.5
(2)(37-
3.6÷
4.8)÷
12.5
(3)
2.6+
2.4×(
1.4-
1.05)
(4)
15.6÷16×(
0.25+
1.25)
30.8÷[14-
9.85+
1.07][60-
9.5+
28.9]÷
0.
182.881÷
0.43-
0.24×
3.520×[
2.44-
1.8÷
0.4+
0.15]28-
3.4+
1.25×
2.
42.55×
7.1+
2.45×
7.1777×9+1111×
30.8×[
15.5-
3.21+
5.79]
31.8+
3.2×4÷
531.5×4÷6+
30.64×25×
7.8+
2.22÷
2.5+
2.5÷
236.25÷
4.25×
9.95180-705×624÷
2.4-
2.5×
0.84121+2389÷7671×15-974469×12+
149219.4×
6.1×
2.
35.67×
0.2-
0.
6218.1×
0.92+
3.
930.4×
0.7×
0.
250.78+
5.436+
14.8×5÷4+1÷
49.9x5÷6+5÷
610.3÷4x8÷9-1÷
314.31x5÷6-5÷
616.5÷9x18-14x2÷
720.3x2÷9+1÷
335.95÷(64-45)
36.178-145÷5×6+
427.2÷
0.8-
1.2×
56.5×(
4.8-
1.2×4)28-
3.4+
1.25×
2.
42.55×
7.1+
2.45×
7.1777×9+1111×3(
31.8+
3.2×4)÷
531.5×4÷6+
30.64×25×
7.8+
2.22÷
2.5+
2.5÷2194-
64.8÷
1.8×
0.
936.72÷
4.25×
9.95180-705×624÷
2.4-
2.5×
0.84121+2389÷7671×15-974469×...。