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计算(1)3.75×4.8+63.5×0.48-48×0.01(2)11×22+0.22×3300+330×4.4(3)(10-355×1)+(9-355×2)+(8-355×3)+…+(1-355×10).
题目详情
计算
(1)3.75×4.8+63.5×0.48-48×0.01
(2)11×22+0.22×3300+330×4.4
(3)(10-
×1)+(9-
×2)+(8-
×3)+…+(1-
×10).
(1)3.75×4.8+63.5×0.48-48×0.01
(2)11×22+0.22×3300+330×4.4
(3)(10-
3 |
55 |
3 |
55 |
3 |
55 |
3 |
55 |
▼优质解答
答案和解析
(1)3.75×4.8+63.5×0.48-48×0.01
=3.75×4.8+6.35×4.8-4.8×0.1
=(3.75+6.35-0.1)×4.8
=10×4.8
=48;
(2)11×22+0.22×3300+330×4.4
=11×22+22×33+33×44
=(11+33)×22+33×44
=44×22+33×44
=44×(22+33)
=44×55
=2420;
(3)(10-
×1)+(9-
×2)+(8-
×3)+…+(1-
×10)
=10-
×1+9-
×2+8-
×3+…+1-
×10
=(10+9+8+…+1)-(
×1+
×2+
×3+…+
×10)
=(10+9+8+…+1)-
×(1+2+3+…+10)
=(10+9+8+…+1)×(1-
)
=55×
=52.
=3.75×4.8+6.35×4.8-4.8×0.1
=(3.75+6.35-0.1)×4.8
=10×4.8
=48;
(2)11×22+0.22×3300+330×4.4
=11×22+22×33+33×44
=(11+33)×22+33×44
=44×22+33×44
=44×(22+33)
=44×55
=2420;
(3)(10-
3 |
55 |
3 |
55 |
3 |
55 |
3 |
55 |
=10-
3 |
55 |
3 |
55 |
3 |
55 |
3 |
55 |
=(10+9+8+…+1)-(
3 |
55 |
3 |
55 |
3 |
55 |
3 |
55 |
=(10+9+8+…+1)-
3 |
55 |
=(10+9+8+…+1)×(1-
3 |
55 |
=55×
52 |
55 |
=52.
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