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脱式计算,能简便计算的要简便计算(2.8+2.8+2.8+2.8)×0.25511×43%+511×57%(1-12-14)÷141.5×7.4+0.6×150%+2÷23.

题目详情
脱式计算,能简便计算的要简便计算
(2.8+2.8+2.8+2.8)×0.25
5
11
×43%+
5
11
×57%
(1-
1
2
-
1
4
)÷
1
4

1.5×7.4+0.6×150%+2÷
2
3
▼优质解答
答案和解析
(1)(2.8+2.8+2.8+2.8)×0.25
=2.8×4×0.25
=2.8×(4×0.25)
=2.8×1
=2.8

(2)
5
11
×43%+
5
11
×57%
=
5
11
×(0.43+0.57)
=
5
11
×1
=
5
11


(3)(1-
1
2
-
1
4
)÷
1
4

=(1-
1
2
-
1
4
)×4
=1×4-
1
2
×4-
1
4
×4
=4-2-1
=1

(4)1.5×7.4+0.6×150%+2÷
2
3

=1.5×7.4+0.6×1.50+2×1.5
=1.5×(7.4+0.6+2)
=1.5×10
=15