1.用竖式计算。
0.78 + 5.4 = 18.4 − 0.75 = 5.61 + 4.39 =
6.7 × 0.6 = 3.22 × 200 = 0.48 × 2.3 =
0.78 + 5.4 = 18.4 − 0.75 = 5.61 + 4.39 =
6.7 × 0.6 = 3.22 × 200 = 0.48 × 2.3 =
答案:


2.计算下面各题,能简算的要简算。
7.1 × (4.2 + 0.57) 0.65 × 6.4 + 0.65 × 3.6 57.3 − 2.5 × 0.4
12 × 0.35 − 1.1 × 3.5 2.4 × (20.6 − 2.6) 1.6 × 5.4 + 4.6
7.1 × (4.2 + 0.57) 0.65 × 6.4 + 0.65 × 3.6 57.3 − 2.5 × 0.4
12 × 0.35 − 1.1 × 3.5 2.4 × (20.6 − 2.6) 1.6 × 5.4 + 4.6
答案:
7.1×(4.2 + 0.57)
= 7.1×4.77
= 33.867
0.65×6.4 + 0.65×3.6
= 0.65×(6.4 + 3.6)
= 0.65×10
= 6.5
57.3 - 2.5×0.4
= 57.3 - 1
= 56.3
12×0.35 - 1.1×3.5
= 1.2×3.5 - 1.1×3.5
= 3.5×(1.2 - 1.1)
= 3.5×0.1
= 0.35
2.4×(20.6 - 2.6)
= 2.4×18
= 43.2
1.6×5.4 + 4.6
= 8.64 + 4.6
= 13.24
= 7.1×4.77
= 33.867
0.65×6.4 + 0.65×3.6
= 0.65×(6.4 + 3.6)
= 0.65×10
= 6.5
57.3 - 2.5×0.4
= 57.3 - 1
= 56.3
12×0.35 - 1.1×3.5
= 1.2×3.5 - 1.1×3.5
= 3.5×(1.2 - 1.1)
= 3.5×0.1
= 0.35
2.4×(20.6 - 2.6)
= 2.4×18
= 43.2
1.6×5.4 + 4.6
= 8.64 + 4.6
= 13.24
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