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1 直接写出结果。
7.23+8.91=
15.4−6.78=
2.345+6.789=
12−4.567=
2.6×0.25=
4.8×1.75=
0.72×3.5=
2.5×0.48=
7.56÷0.9=
4.2÷1.2=
9.6÷0.8=
13.5÷2.5=
4.2×0.6+1.8=
5.6−2.4÷0.8=
(3.2+1.8)×0.7=
6.3÷0.9×0.4=
7.23+8.91=
15.4−6.78=
2.345+6.789=
12−4.567=
2.6×0.25=
4.8×1.75=
0.72×3.5=
2.5×0.48=
7.56÷0.9=
4.2÷1.2=
9.6÷0.8=
13.5÷2.5=
4.2×0.6+1.8=
5.6−2.4÷0.8=
(3.2+1.8)×0.7=
6.3÷0.9×0.4=
答案
1 16.14 8.62 9.134 7.433 0.65 8.4 2.52 1.2
8.4 3.5 12 5.4 4.32 2.6 3.5 2.8
8.4 3.5 12 5.4 4.32 2.6 3.5 2.8
2 递等式计算。（能简便的用简便方法计算）
(1) $189.63 - (72.45 - 30.37)$
(2) $324.78 + 125.22 - 84.56 - 15.44$
(3) $1.25 × (0.8 × 62.5)$
(4) $6.39 ÷ 0.9 × 2.4$
(5) $(145.6 - 45.6) × 3.72 ÷ 5$
(6) $3.6 × 1.5 + 7.2 ÷ 0.6$
(7) $15.8 × 6.3 + 5.8 × 3.7$
(8) $(6.2 × 1.25 + 1.25 × 2.6) ÷ 2.2$
(1) $189.63 - (72.45 - 30.37)$
(2) $324.78 + 125.22 - 84.56 - 15.44$
(3) $1.25 × (0.8 × 62.5)$
(4) $6.39 ÷ 0.9 × 2.4$
(5) $(145.6 - 45.6) × 3.72 ÷ 5$
(6) $3.6 × 1.5 + 7.2 ÷ 0.6$
(7) $15.8 × 6.3 + 5.8 × 3.7$
(8) $(6.2 × 1.25 + 1.25 × 2.6) ÷ 2.2$
答案
(1) 147.55 (2) 350 (3) 62.5 (4) 17.04
(5) 74.4 (6) 17.4 (7) 121 (8) 5
(5) 74.4 (6) 17.4 (7) 121 (8) 5
